Linux on Amiga A600, a success story (in progress, with possible patch)

Linux on Amiga A600, a success story (in progress, with possible patch)

[Patrick Bottelberger]

[-- Attachment #1: Type: text/plain, Size: 3055 bytes --]

Hi there,

thanks to some hardware upgrades to my Amiga A600 (A603 chip memory
expansion to 2MB, Kickstart 3.1 rom, CF-IDE-Adapter with 4GB CF-card,
PCMCIA network card and ACA630 CPU replacement board containig a 68030,
but no FPU) i decided i could finally try to get Linux running on that
machine. So i debootstrapped a basic system to my CF-card, compiled a
standard amiga-kernel 3.1.4 (with CONFIG_M68KFPU_EMU_ONLY activated) and
tried to start it. At first, the Amiga froze every time i started
amiboot, so i tried supplying my cpu type by hand (with "-p 202") and it
worked, but after loading the kernel the amiga fired off a "guru
meditation" 00000004 (illegal instruction). After messing around with
some kconfig-options and rebuilding the kernel several time without
getting anywhere i looked at the build process for the NetBSD-kernel i
successfully built for the Amiga before and noticed, that the
NetBSD-guys are building their Amiga-kernel with -msoft-float. So after
applying that to the Linux-kernel (patch attached) the kernel booted,
but died directly after initializing the the framebuffer, just at
activating the serial console, with a very long panic message. I
couldn't get any output via the serial port (with console=ttyS0), so i
made a video of the Amiga booting with my (very bad) handy camera. I'm
sorry i can't give you a proper boot log becaus of that. If you would
need one i could try to make a video of the boot process with the
digital camera of my father and either upload that somewhere or write
the messages in the video down. I could make out some of the first lines
in the panic:

Data Read fault at 0x00000020 in Super Data (pcb0xb7e08)
BAD KERNEL BUSERR
Oops: 00000000
PC: (...) internal_create_group+...

The first command in the trace was a call to mm_release, so i figured
the fpu emulator was crashing something inside the sysfs-part of the
kernel. So i tried recompiling the kernel with CONFIG_EXPERT activated
and CONFIG_SYSFS deactivated and it works! After uninstalling udev from
the debian system and mknod'ing all needed device-files everything seems
to be running fine, with the exception of the RTC (i think that's my
fault, something i missed while configuring my kernel, is there
something needed besides of genrtc to get the A600/A603-clock working?)
and the PCMCIA network card (some card with NE2000-chip, it works
flawlessly under AmigaOS with cnet.device and NetBSD, when inserting the
apne module i get "ethernet PCMCIA card inserted", followed by "device
not found". Maybe i'm missing a device file here?).

So, i wanted to thank all of you linux-m68k-staff here for making it
possible to get my favorite OS running on my favorite little computer
pal :-)
If you are interested, i could give you further information (my
kernel-config, for example) or get you updated, if i get the last
missing parts to run. And, like i said before, if you are interested i
could try to get that kernel panic in a readable form, so you could try
to analyze the error.

Thanks again, and bye!



Regards,
Patrick

[-- Attachment #2: linux-m68k-nofpu.patch --]
[-- Type: text/plain, Size: 478 bytes --]

--- linux-source-3.1.orig/arch/m68k/Makefile_mm	2011-11-28 23:48:14.000000000 +0100
+++ linux-source-3.1/arch/m68k/Makefile_mm	2012-01-14 17:34:55.000000000 +0100
@@ -33,6 +33,10 @@
 # without -fno-strength-reduce the 53c7xx.c driver fails ;-(
 KBUILD_CFLAGS += -pipe -fno-strength-reduce -ffixed-a2
 
+ifdef CONFIG_M68KFPU_EMU_ONLY
+KBUILD_CFLAGS += -msoft-float
+endif
+
 # enable processor switch if compiled only for a single cpu
 ifndef CONFIG_M68020
 ifndef CONFIG_M68030

Re: Linux on Amiga A600, a success story (in progress, with possible patch)

[Geert Uytterhoeven]

Hi Patrick,

On Sun, Jan 22, 2012 at 19:37, Patrick Bottelberger
<patrick.bottelberger@sigon.net> wrote:
> tried to start it. At first, the Amiga froze every time i started
> amiboot, so i tried supplying my cpu type by hand (with "-p 202") and it
> worked, but after loading the kernel the amiga fired off a "guru

What did Amiboot detect without the `-p` option (you may want ti try `-d')?
Does it assume a 68882 FPU?

> meditation" 00000004 (illegal instruction). After messing around with
> some kconfig-options and rebuilding the kernel several time without
> getting anywhere i looked at the build process for the NetBSD-kernel i
> successfully built for the Amiga before and noticed, that the
> NetBSD-guys are building their Amiga-kernel with -msoft-float. So after
> applying that to the Linux-kernel (patch attached) the kernel booted,

Strange, -msoft-float should not be needed, as the kernel shouldn't use any
floating point instructions (besides saving/restoring FPU state, which
it shouldn't do with CONFIG_M68KFPU_EMU_ONLY).

> but died directly after initializing the the framebuffer, just at
> activating the serial console, with a very long panic message. I
> couldn't get any output via the serial port (with console=ttyS0), so i
> made a video of the Amiga booting with my (very bad) handy camera. I'm
> sorry i can't give you a proper boot log becaus of that. If you would

Have you tried `debug=mem', and running the AmigaOS dmesg afterwards?

> need one i could try to make a video of the boot process with the
> digital camera of my father and either upload that somewhere or write
> the messages in the video down. I could make out some of the first lines
> in the panic:
>
> Data Read fault at 0x00000020 in Super Data (pcb0xb7e08)
> BAD KERNEL BUSERR
> Oops: 00000000
> PC: (...) internal_create_group+...
>
> The first command in the trace was a call to mm_release, so i figured
> the fpu emulator was crashing something inside the sysfs-part of the
> kernel. So i tried recompiling the kernel with CONFIG_EXPERT activated
> and CONFIG_SYSFS deactivated and it works! After uninstalling udev from

I'd expected this to be the topology issue, but that change doesn't seem
to be in 3.1.4. I'll see whether I can reproduce this.

> the debian system and mknod'ing all needed device-files everything seems
> to be running fine, with the exception of the RTC (i think that's my
> fault, something i missed while configuring my kernel, is there
> something needed besides of genrtc to get the A600/A603-clock working?)

Do you know what clock chip is used on the A603? I had a quick look on the
net, but couldn't find it (I did see a picture of an A604 with a partially
covered chip that said M6242). If you can't find it, I can ask Jens.

Currently, Linux assumes an A2000 clock chip, which is an Oki MSM6242.
If it's a Ricoh RP5C01, you have to modify arch/m68k/amiga/config.c to
select an A3000 clock chip on A600.

> and the PCMCIA network card (some card with NE2000-chip, it works
> flawlessly under AmigaOS with cnet.device and NetBSD, when inserting the
> apne module i get "ethernet PCMCIA card inserted", followed by "device
> not found". Maybe i'm missing a device file here?).

Sorry, cannot help you there.

Thanks for your report!

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

Re: Linux on Amiga A600, a success story (in progress, with possible patch)

[Michael Schmitz]

Hi,

>> the debian system and mknod'ing all needed device-files everything seems
>> to be running fine, with the exception of the RTC (i think that's my
>> fault, something i missed while configuring my kernel, is there
>> something needed besides of genrtc to get the A600/A603-clock working?)
>
> Do you know what clock chip is used on the A603? I had a quick look on the
> net, but couldn't find it (I did see a picture of an A604 with a partially
> covered chip that said M6242). If you can't find it, I can ask Jens.

Might be the wrong /dev/rtc device - it should be major 254 minor 0
not major 10 minor 135 (or whatever).

Cheers,

  Michael

Re: Linux on Amiga A600, a success story (in progress, with possible patch)

[Geert Uytterhoeven]

On Tue, Jan 24, 2012 at 00:04, Michael Schmitz
<schmitzmic@googlemail.com> wrote:
>>> the debian system and mknod'ing all needed device-files everything seems
>>> to be running fine, with the exception of the RTC (i think that's my
>>> fault, something i missed while configuring my kernel, is there
>>> something needed besides of genrtc to get the A600/A603-clock working?)
>>
>> Do you know what clock chip is used on the A603? I had a quick look on the
>> net, but couldn't find it (I did see a picture of an A604 with a partially
>> covered chip that said M6242). If you can't find it, I can ask Jens.
>
> Might be the wrong /dev/rtc device - it should be major 254 minor 0
> not major 10 minor 135 (or whatever).

That can also be the problem. Note that the 254/0 is a dynamic number,
so it may be different for you.

You can check under /sys/class/devices whether your rtc was found.
I think there's also a virtual file there to show the current time without
having to use hwclock.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

Re: Linux on Amiga A600, a success story (in progress, with possible patch)

[Patrick Bottelberger]

Hi Michael,

Michael Schmitz schrieb:
> Might be the wrong /dev/rtc device - it should be major 254 minor 0
> not major 10 minor 135 (or whatever).
>   
I tried major 254 with minor 1 to 10, none of the nodes seems to be
connected. I thought 254/x was used by CONFIG_RTC_CLASS and 10/135 by
CONFIG_GEN_RTC? I'll compile the kernel with CONFIG_RTC_CLASS and try again.


Regards
Patrick

Re: Linux on Amiga A600, a success story (in progress, with possible patch)

[Geert Uytterhoeven]

Hi Patrick,

On Tue, Jan 24, 2012 at 18:56, Patrick Bottelberger
<patrick.bottelberger@sigon.net> wrote:
> Michael Schmitz schrieb:
>> Might be the wrong /dev/rtc device - it should be major 254 minor 0
>> not major 10 minor 135 (or whatever).
>>
> I tried major 254 with minor 1 to 10, none of the nodes seems to be
> connected. I thought 254/x was used by CONFIG_RTC_CLASS and 10/135 by
> CONFIG_GEN_RTC? I'll compile the kernel with CONFIG_RTC_CLASS and try again.

These days you need CONFIG_RTC_CLASS and CONFIG_RTC_DRV_MSM6242.
CONFIG_GEN_RTC only works with old-style RTC drivers, which we no longer
use on Amiga.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

Re: Linux on Amiga A600, a success story (in progress, with possible patch)

[Thorsten Glaser]

Michael Schmitz <schmitzmic <at> googlemail.com> writes:

> Might be the wrong /dev/rtc device - it should be major 254 minor 0

Actually, it should be /dev/rtc0 (according to my Debian system)
and you can find out the correct major number like this:

root@ara5:~ # ll /dev/rtc*
crw------- 1 root root 254, 0 Dec 26 16:48 /dev/rtc0
root@ara5:~ # fgrep rtc /proc/devices
254 rtc

This is auto-created from devtmpfs (no udev here), FWIW.
My ARAnyM command line contains devtmpfs.mount=1 coupled
with a few lines in /etc/rc.local:

(test -e /dev/fd || ln -s /proc/self/fd /dev/fd || :)
(test -e /dev/stdin || ln -s /proc/self/fd/0 /dev/stdin || :)
(test -e /dev/stdout || ln -s /proc/self/fd/1 /dev/stdout || :)
(test -e /dev/stderr || ln -s /proc/self/fd/2 /dev/stderr || :)

bye,
//mirabilos

Re: Linux on Amiga A600, a success story (in progress, with possible patch)

[Michael Schmitz]

Hi Thorsten,

Might be the wrong /dev/rtc device - it should be major 254 minor 0

> Actually, it should be /dev/rtc0 (according to my Debian system)
hwclock attempts to open /dev/rtc which is symlinked to rtc0 if udev is 
used.
> and you can find out the correct major number like this:
>
> root@ara5:~ # ll /dev/rtc*
> crw------- 1 root root 254, 0 Dec 26 16:48 /dev/rtc0
> root@ara5:~ # fgrep rtc /proc/devices
> 254 rtc
>
> This is auto-created from devtmpfs (no udev here), FWIW.
With no helpers at all, the devices need to be static files present in 
/dev. The old makedev scripts
(/dev/MAKEDEV) probably need to be overhauled to create the correct 
files to cover this case.
My copy on the Falcon will still create a misc device for RTC,
> My ARAnyM command line contains devtmpfs.mount=1 coupled
> with a few lines in /etc/rc.local:
>
> (test -e /dev/fd || ln -s /proc/self/fd /dev/fd || :)
> (test -e /dev/stdin || ln -s /proc/self/fd/0 /dev/stdin || :)
> (test -e /dev/stdout || ln -s /proc/self/fd/1 /dev/stdout || :)
> (test -e /dev/stderr || ln -s /proc/self/fd/2 /dev/stderr || :)
rc.local hacks are always possible as a last resort :-) Good one, though.

Cheers,

   Michael

Re: Linux on Amiga A600, a success story (in progress, with possible patch)

[Thorsten Glaser]

Michael Schmitz dixit:

>> Actually, it should be /dev/rtc0 (according to my Debian system)
> hwclock attempts to open /dev/rtc which is symlinked to rtc0 if udev is used.

Oh, fun. Good to know, then. (I just use NTP, always…)

> With no helpers at all, the devices need to be static files present in /dev.

Yeah, but devtmpfs creates /dev/rtc0 just fine ;-)

> rc.local hacks are always possible as a last resort :-) Good one, though.

They are better than having to use udev, I guess.
Probably should place the symlink for /dev/rtc in there, too…
on the other hand, nope, not needed:

open("/dev/rtc", O_RDONLY|O_LARGEFILE)  = -1 ENOENT (No such file or directory)
SYS_333(0x8000520d, 0x20000, 0, 0x8000520d, 0) = -1072368512
SYS_333(0x2d, 0xc00182e0, 0x80000724, 0, 0) = -1072368512
SYS_333(0, 0xc00182e0, 0x800007d7, 0, 0) = -1072368512
SYS_333(0x2, 0x8000520d, 0, 0, 0)       = -1072368512
SYS_333(0x2, 0, 0, 0x8000668e, 0)       = -1072368512
open("/dev/rtc0", O_RDONLY|O_LARGEFILE) = 3

(What’s SYS_333, and why does strace not know it?)

bye,
//mirabilos
-- 
  “Having a smoking section in a restaurant is like having
          a peeing section in a swimming pool.”
						-- Edward Burr

Re: Linux on Amiga A600, a success story (in progress, with possible patch)

[Geert Uytterhoeven]

On Sat, Jan 28, 2012 at 21:43, Thorsten Glaser <tg@mirbsd.de> wrote:
> open("/dev/rtc", O_RDONLY|O_LARGEFILE)  = -1 ENOENT (No such file or directory)
> SYS_333(0x8000520d, 0x20000, 0, 0x8000520d, 0) = -1072368512
> SYS_333(0x2d, 0xc00182e0, 0x80000724, 0, 0) = -1072368512
> SYS_333(0, 0xc00182e0, 0x800007d7, 0, 0) = -1072368512
> SYS_333(0x2, 0x8000520d, 0, 0, 0)       = -1072368512
> SYS_333(0x2, 0, 0, 0x8000668e, 0)       = -1072368512
> open("/dev/rtc0", O_RDONLY|O_LARGEFILE) = 3
>
> (What’s SYS_333, and why does strace not know it?)

#define __NR_get_thread_area    333

Thread Local Storage.

-ESTRACE_TOO_OLD?
-ESTRACE_NEVER_UPDATED?

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

Re: Linux on Amiga A600, a success story (in progress, with possible patch)

[Thorsten Glaser]

Geert Uytterhoeven dixit:

>> (What’s SYS_333, and why does strace not know it?)
>
>#define __NR_get_thread_area    333
>
>Thread Local Storage.

Ah.

>-ESTRACE_TOO_OLD?
>-ESTRACE_NEVER_UPDATED?

Probably the latter… it’s been rebuilt after TLS was
introduced, and was updated in Debian too.

bye,
//mirabilos
-- 
  “Having a smoking section in a restaurant is like having
          a peeing section in a swimming pool.”
						-- Edward Burr

Re: Linux on Amiga A600, a success story (in progress, with possible patch)

[Patrick Bottelberger]

[-- Attachment #1: Type: text/plain, Size: 1853 bytes --]

Hi Geert,

Geert Uytterhoeven schrieb:
> What did Amiboot detect without the `-p` option (you may want ti try `-d')?
> Does it assume a 68882 FPU?
>   
Without supplying the '-p' parameter amiboot didn't output anything at
all, it just froze the amiga directly after entering the command.
> Have you tried `debug=mem', and running the AmigaOS dmesg afterwards?
>   
I didn't know about the AmigaOS dmesg, thanks for telling me! I attached
the dmesg output of it.
> I'd expected this to be the topology issue, but that change doesn't seem
> to be in 3.1.4. I'll see whether I can reproduce this.
>   
Call Trace: [<0000ffff>] mm_release+0xa1/0xa4
 [<002b84fa>] topology_sysfs_init+0x0/0x1e

Seems to prove that, do you think
http://www.spinics.net/lists/linux-m68k/msg04709.html would solve the issue?
> Do you know what clock chip is used on the A603? I had a quick look on the
> net, but couldn't find it (I did see a picture of an A604 with a partially
> covered chip that said M6242). If you can't find it, I can ask Jens.
>
> Currently, Linux assumes an A2000 clock chip, which is an Oki MSM6242.
> If it's a Ricoh RP5C01, you have to modify arch/m68k/amiga/config.c to
> select an A3000 clock chip on A600.
>   
The kernel outputs: "Amiga hardware found: (...) A2000_CLK (...)", can i
rely on that message, or should i get the A603 out of the case and check
the chip to be sure?
>> and the PCMCIA network card (some card with NE2000-chip, it works
>> flawlessly under AmigaOS with cnet.device and NetBSD, when inserting the
>> apne module i get "ethernet PCMCIA card inserted", followed by "device
>> not found". Maybe i'm missing a device file here?).
>>     
>
> Sorry, cannot help you there.
>   
OK, i will keep you informed if i find a solution for the PCMCIA-card.
> Thanks for your report!
>   
Thanks for helping me! :-)


Regards
Patrick


[-- Attachment #2: dmesg_a600.txt --]
[-- Type: text/plain, Size: 4963 bytes --]

Searching for SAVEKMSG magic...
Found 4858 bytes at 0x001e0010
>>>>>>>>>>>>>>>>>>>>
Linux version 3.1.4-amiga (3.1.4) (root@virtudepp) (gcc version 4.4.6 (Debian 4.4.6-6) ) #1 Sat Jan 14 17:48:12 CET 2012
console [debug0] enabled
Amiga hardware found: [A600] VIDEO BLITTER AUDIO FLOPPY A1200_IDE KEYBOARD MOUSE SERIAL PARALLEL A2000_CLK CHIP_RAM PAULA DENISE_HR AGNUS_HR_PAL PCMCIA ZORRO 
On node 0 totalpages: 7936
free_area_init_node: node 0, pgdat 0028fef4, node_mem_map 002c7000
  DMA zone: 70 pages used for memmap
  DMA zone: 0 pages reserved
  DMA zone: 7866 pages, LIFO batch:0
pcpu-alloc: s0 r0 d32768 u32768 alloc=1*32768
pcpu-alloc: [0] 0 
Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 7866
Kernel command line: root=/dev/hda5 debug=mem BOOT_IMAGE=vmlinux-putt
PID hash table entries: 128 (order: -3, 512 bytes)
Dentry cache hash table entries: 4096 (order: 2, 16384 bytes)
Inode-cache hash table entries: 2048 (order: 1, 8192 bytes)
Memory: 28548k/28548k available (2044k kernel code, 1028k data, 124k init)
Console: colour dummy device 80x25
console [tty0] enabled
Calibrating delay loop... 6.01 BogoMIPS (lpj=30080)
pid_max: default: 32768 minimum: 301
Mount-cache hash table entries: 512
NET: Registered protocol family 16
bio: create slab <bio-0> at 0
SCSI subsystem initialized
NET: Registered protocol family 2
IP route cache hash table entries: 1024 (order: 0, 4096 bytes)
TCP established hash table entries: 1024 (order: 1, 8192 bytes)
TCP bind hash table entries: 1024 (order: 0, 4096 bytes)
TCP: Hash tables configured (established 1024 bind 1024)
TCP reno registered
UDP hash table entries: 256 (order: 0, 4096 bytes)
UDP-Lite hash table entries: 256 (order: 0, 4096 bytes)
NET: Registered protocol family 1
VFS: Disk quotas dquot_6.5.2
Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)
msgmni has been set to 55
Block layer SCSI generic (bsg) driver version 0.4 loaded (major 254)
io scheduler noop registered
io scheduler deadline registered
io scheduler cfq registered (default)
Console: switching to colour frame buffer device 80x32
fb0: Amiga ECS frame buffer device, using 640K of video memory
Amiga-builtin serial driver version 4.30
ttyS0 is the amiga builtin serial port
Data read fault at 0x00000020 in Super Data (pc=0xb7e08)
BAD KERNEL BUSERR
Oops: 00000000
Modules linked in:
PC: [<000b7e08>] internal_create_group+0x16e/0x1b8
SR: 2004  SP: 01819ee8  a2: 01816870
d0: 00000000    d1: 00000016    d2: 00000000    d3: 00000000
d4: 00000000    d5: 00000000    a0: 00000008    a1: 00000186
Process swapper (pid: 1, task=01816870)
Frame format=B ssw=074d isc=6600 isb=feb6 daddr=00000020 dobuf=00000000
baddr=000b7e0e dibuf=00000000 ver=f
Stack from 01819f70:
        00000000 00000000 402d9408 00000000 402dd0d8 0000ffff 002b84fa 00002008
        40223004 00000000 0027fff8 000b7e76 00000008 00000000 002898f4 002b8512
        00000008 002898f4 00000000 00002022 00000000 000000e6 402d9408 00000000
        402dd0d8 002c2aa4 00002008 40223004 00002008 002b3e14 002a5b34 002b84fa
        002a5ac8 40001000 0000290c 00000000
Call Trace: [<0000ffff>] mm_release+0xa1/0xa4
 [<002b84fa>] topology_sysfs_init+0x0/0x1e
 [<00002008>] do_one_initcall+0x0/0x1c0
 [<000b7e76>] sysfs_create_group+0xe/0x14
 [<002b8512>] topology_sysfs_init+0x18/0x1e
 [<00002022>] do_one_initcall+0x1a/0x1c0
 [<00002008>] do_one_initcall+0x0/0x1c0
 [<00002008>] do_one_initcall+0x0/0x1c0
 [<002b3e14>] cpu_dev_init+0xc/0x10
 [<002a5b34>] kernel_init+0x6c/0xee
 [<002b84fa>] topology_sysfs_init+0x0/0x1e
 [<002a5ac8>] kernel_init+0x0/0xee
 [<0000290c>] kernel_thread+0x3a/0x4e

Code: 4a88 66d4 6000 ff72 286e fffc 6080 2047 <4aa8> 0018 6600 feb6 4878 0041 4879 0024 befe 4879 0024 0cd6 4eb9 001f c6e4 4e47
Disabling lock debugging due to kernel taint
Kernel panic - not syncing: Attempted to kill init!
Call Trace: [<001fc5a4>] panic+0x54/0x194
 [<00014b84>] do_exit+0x5ea/0x6ca
 [<001fc6e4>] printk+0x0/0x1c
 [<00003254>] bad_super_trap+0x0/0x18e
 [<000039fe>] buserr_c+0x2d8/0x3a2
 [<002b84fa>] topology_sysfs_init+0x0/0x1e
 [<00002008>] do_one_initcall+0x0/0x1c0
 [<000025c6>] buserr+0x1e/0x24
 [<000b7e10>] internal_create_group+0x176/0x1b8
 [<000b7e0e>] internal_create_group+0x174/0x1b8
 [<000b7e0c>] internal_create_group+0x172/0x1b8
 [<0018ff0d>] skb_gso_segment+0x193/0x2ba
 [<000ff6ec>] blk_rq_map_kern+0x9e/0x12c
 [<00003f1c>] request_irq+0xe/0x42
 [<00003f1c>] request_irq+0xe/0x42
 [<0000ffff>] mm_release+0xa1/0xa4
 [<002b84fa>] topology_sysfs_init+0x0/0x1e
 [<00002008>] do_one_initcall+0x0/0x1c0
 [<000b7e76>] sysfs_create_group+0xe/0x14
 [<002b8512>] topology_sysfs_init+0x18/0x1e
 [<00002022>] do_one_initcall+0x1a/0x1c0
 [<00002008>] do_one_initcall+0x0/0x1c0
 [<00002008>] do_one_initcall+0x0/0x1c0
 [<002b3e14>] cpu_dev_init+0xc/0x10
 [<002a5b34>] kernel_init+0x6c/0xee
 [<002b84fa>] topology_sysfs_init+0x0/0x1e
 [<002a5ac8>] kernel_init+0x0/0xee
 [<0000290c>] kernel_thread+0x3a/0x4e

<<<<<<<<<<<<<<<<<<<<

Re: Linux on Amiga A600, a success story (in progress, with possible patch)

[Geert Uytterhoeven]

Hi Patrick,

On Tue, Jan 24, 2012 at 18:35, Patrick Bottelberger
<patrick.bottelberger@sigon.net> wrote:
> Geert Uytterhoeven schrieb:
>> What did Amiboot detect without the `-p` option (you may want ti try `-d')?
>> Does it assume a 68882 FPU?
>>
> Without supplying the '-p' parameter amiboot didn't output anything at
> all, it just froze the amiga directly after entering the command.

Even with '-d'?

>> I'd expected this to be the topology issue, but that change doesn't seem
>> to be in 3.1.4. I'll see whether I can reproduce this.

I can't reproduce it on ARAnyM with 3.1.4.

> Call Trace: [<0000ffff>] mm_release+0xa1/0xa4
>  [<002b84fa>] topology_sysfs_init+0x0/0x1e
>
> Seems to prove that, do you think

But this indeed looks like the same problem. Are you using a Debianized 3.1.4
source tree?

> http://www.spinics.net/lists/linux-m68k/msg04709.html would solve the issue?

Yes, that should fix this problem.

>> Do you know what clock chip is used on the A603? I had a quick look on the
>> net, but couldn't find it (I did see a picture of an A604 with a partially
>> covered chip that said M6242). If you can't find it, I can ask Jens.
>>
>> Currently, Linux assumes an A2000 clock chip, which is an Oki MSM6242.
>> If it's a Ricoh RP5C01, you have to modify arch/m68k/amiga/config.c to
>> select an A3000 clock chip on A600.
>>
> The kernel outputs: "Amiga hardware found: (...) A2000_CLK (...)", can i
> rely on that message, or should i get the A603 out of the case and check
> the chip to be sure?

You cannot rely on that message. It just assumes A2000/A500/A600 etc.
have an A2000-style clock chip. But on all but A2000 the RTC is optional.
BTW, I also asked Jens Schönfeld.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

Re: Linux on Amiga A600, a success story (in progress, with possible patch)

[Geert Uytterhoeven]

On Tue, Jan 24, 2012 at 22:17, Geert Uytterhoeven <geert@linux-m68k.org> wrote:
>>> Currently, Linux assumes an A2000 clock chip, which is an Oki MSM6242.
>>> If it's a Ricoh RP5C01, you have to modify arch/m68k/amiga/config.c to
>>> select an A3000 clock chip on A600.
>>>
>> The kernel outputs: "Amiga hardware found: (...) A2000_CLK (...)", can i
>> rely on that message, or should i get the A603 out of the case and check
>> the chip to be sure?
>
> You cannot rely on that message. It just assumes A2000/A500/A600 etc.
> have an A2000-style clock chip. But on all but A2000 the RTC is optional.
> BTW, I also asked Jens Schönfeld.

Jens confirmed it has an MSM6242.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

Re: Linux on Amiga A600, a success story (in progress, with possible patch)

[Patrick Bottelberger]

Hi Geert,

Geert Uytterhoeven schrieb:
>> Without supplying the '-p' parameter amiboot didn't output anything at
>> all, it just froze the amiga directly after entering the command.
>>     
>
> Even with '-d'?
>   
Yes, even with "-d", no output is printed, after entering the command
("amiboot -d root=/dev/hda5" for example) and pressing "enter" the
system freezes immediately.

> I can't reproduce it on ARAnyM with 3.1.4.
>
>   
>> Call Trace: [<0000ffff>] mm_release+0xa1/0xa4
>>  [<002b84fa>] topology_sysfs_init+0x0/0x1e
>>
>> Seems to prove that, do you think
>>     
>
> But this indeed looks like the same problem. Are you using a Debianized 3.1.4
> source tree?
>   
I just checked again, yes, you're right, i totally forgot i patched my
source tree with the Debian patches, sorry :-(

>> http://www.spinics.net/lists/linux-m68k/msg04709.html would solve the issue?
>>     
>
> Yes, that should fix this problem.
>   
It really did! Thank you for pointing me in the right direction, now i
got sysfs and udev again.
> You cannot rely on that message. It just assumes A2000/A500/A600 etc.
> have an A2000-style clock chip. But on all but A2000 the RTC is optional.
> BTW, I also asked Jens Schönfeld.
>   
After activating CONFIG_RTC_CLASS and CONFIG_RTC_DRV_MSM6242 in the
kernel and finally being able to get the device nodes created
automatically by udev, the RTC now works... somewhat. 8 out of 10 reads
from the RTC (via hctosys inside the kernel at startup, hwclock from
userspace or cat one of the special files inside /sys/class/rtc) return
successfully, but the other 2 return an ioctl()-error. I forgot which
exactly, i'll go upstairs to the Amiga later and write it down.

The PCMCIA-network still doesn't work, i'll recompile the kernel with
CONFIG_APNE=y (instead of m), maybe that will work.


Regards,
Patrick

Re: Linux on Amiga A600, a success story (in progress, with possible patch)

[Patrick Bottelberger]

Hi Geert,

On Wed, 25 Jan 2012 20:11:05 +0100, Patrick Bottelberger
<patrick.bottelberger@sigon.net> wrote:
> After activating CONFIG_RTC_CLASS and CONFIG_RTC_DRV_MSM6242 in the
> kernel and finally being able to get the device nodes created
> automatically by udev, the RTC now works... somewhat. 8 out of 10 reads
> from the RTC (via hctosys inside the kernel at startup, hwclock from
> userspace or cat one of the special files inside /sys/class/rtc) return
> successfully, but the other 2 return an ioctl()-error. I forgot which
> exactly, i'll go upstairs to the Amiga later and write it down.
> 

The error reported by hwclock is:
RTC_RD_TIME: Illegal Argument
ioctl() to /dev/rtc0 to read the time failed.

If reading /sys/class/rtc/rtc0/time with cat, the error is:
cat: /sys/class/rtc/rtc0/time: Invalid Argument

Additional to that, the date seems to be correct every time i read it (for
example with "cat /sys/class/rtc/rtc0/date"), but the time seems to be a
bit strange. Even if the time can be read, i get different times from the
clock. 3 cat's in a row returned:
02:04:16
12:04:18
22:04:19

That seems a bit... odd. Any ideas?

> The PCMCIA-network still doesn't work, i'll recompile the kernel with
> CONFIG_APNE=y (instead of m), maybe that will work.
> 

Still doesn't work, but i don't see anything PCMCIA-related in
/sys/{bus,bus/platform} either. I think that may be the problem, do i need
anything else besides of CONFIG_AMIGA_PCMCIA and CONFIG_APNE?

Maybe it's the debian patches that get everything out of order, i'll try
3.1.10 vanilla, maybe that'll work.


Regards,
Patrick

Re: Linux on Amiga A600, a success story (in progress, with possible patch)

[Patrick Bottelberger]

Hi all,

Patrick Bottelberger schrieb:
> Maybe it's the debian patches that get everything out of order, i'll try
> 3.1.10 vanilla, maybe that'll work.
>   
I compiled a vanilla 3.2.2 kernel tree without Debian patches and
without adding -msoft-float and it runs. It seems one of the
Debian-patches adds some floating-point-operations.
The clock is still flaky and pcmcia still doesn't work. If i find out
why, i'll report again.


Regards,
Patrick

Re: Linux on Amiga A600, a success story (in progress, with possible patch)

[Thorsten Glaser]

Patrick Bottelberger <patrick.bottelberger <at> sigon.net> writes:

> Patrick Bottelberger schrieb:
> > Maybe it's the debian patches that get everything out of order, i'll try
> > 3.1.10 vanilla, maybe that'll work.
> >   
> I compiled a vanilla 3.2.2 kernel tree without Debian patches and
> without adding -msoft-float and it runs. It seems one of the
> Debian-patches adds some floating-point-operations.

I don’t think so. 3.2.2 from Debian is looking good (3.2.4 building),
but you MUST compile with -ffreestanding.

Can you try the 3.2.2 image from debian-ports or my repo
https://www.freewrt.org/~tg/debs68k/dists/sid/main/Upload/unstable/linux-2.6/
and check whether that’s more buggy than vanilla? If so,
you’ve got bugs to report ☺

Thanks,
//mirabilos

Re: Linux on Amiga A600, a success story (in progress, with possible patch)

[Patrick Bottelberger]

Hi Thorsten,

using your kernel, i got the same errors as with my own (flaky RTC and
non-working PCMCIA), but no other errors, especially no illegal
instruction errors. So, you're right, it wasn't the Debian patches after
all, sorry for accusing you  :-)  Maybe my toolchain is doing something
wicked, i don't know :-/

Back to my current problems, i don't think the read errors for the RTC
may be connected to the fact, that i don't have a battery on my A603
board, or could it?
For using the apne driver, am i maybe missing something to get the
PCMCIA bus up and running?

Is there any A1200 user around here that could tell me which files
relating to PCMCIA should be visible in /sys{,/bus,/class} at system
start, if any? Maybe it's the id's of my card that don't get recognised
by the apne driver, but how can i read the id without having access to
the bus itself? pccardctl doesn't find anything, and the corresponding
init-script complains about no existing bridge module, because it can't
find /sys/class/pcmcia_socket

I'm a bit lost at the moment :-/


Regards,
Tjelfe


Thorsten Glaser schrieb:
> Patrick Bottelberger <patrick.bottelberger <at> sigon.net> writes:
>
>   
>> Patrick Bottelberger schrieb:
>>     
>>> Maybe it's the debian patches that get everything out of order, i'll try
>>> 3.1.10 vanilla, maybe that'll work.
>>>   
>>>       
>> I compiled a vanilla 3.2.2 kernel tree without Debian patches and
>> without adding -msoft-float and it runs. It seems one of the
>> Debian-patches adds some floating-point-operations.
>>     
>
> I don’t think so. 3.2.2 from Debian is looking good (3.2.4 building),
> but you MUST compile with -ffreestanding.
>
> Can you try the 3.2.2 image from debian-ports or my repo
> https://www.freewrt.org/~tg/debs68k/dists/sid/main/Upload/unstable/linux-2.6/
> and check whether that’s more buggy than vanilla? If so,
> you’ve got bugs to report ☺
>
> Thanks,
> //mirabilos
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-m68k" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>   

Re: Linux on Amiga A600, a success story (in progress, with possible patch)

[Andreas Schwab]

Patrick Bottelberger <patrick.bottelberger@sigon.net> writes:

> Back to my current problems, i don't think the read errors for the RTC
> may be connected to the fact, that i don't have a battery on my A603
> board, or could it?

The kernel rtc code rejects dates before the Unix epoch.  Typically an
rtc that is reset reports a year before 1970.

Andreas.

-- 
Andreas Schwab, schwab@linux-m68k.org
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."

Re: Linux on Amiga A600, a success story (in progress, with possible patch)

[Patrick Bottelberger]

Hi Andreas,

yes, but after setting the clock (e.g. via "date MMDDhhmmccyy" and
"hwclock --systohc" thereafter) the date and time should be correct, as
long as the computer isn't turned off, right? That's not the case with
my A600, the date stays correct, but the time seems to have difficulties
with the first digit (e.g. jumping between 02:20, 12:20 and 22:20 in a
few seconds) and often returns an EINVAL when trying to read the time.
Trying to access the date (through /sys/class/rtc/rtc0/date for example)
curiously always works. Could it be related to the floating point
emulation? But i don't think the kernel relies on floating point
registers for getting the time from the rtc, or is it?


Regards,
Patrick

Andreas Schwab schrieb:
> Patrick Bottelberger <patrick.bottelberger@sigon.net> writes:
>
>   
>> Back to my current problems, i don't think the read errors for the RTC
>> may be connected to the fact, that i don't have a battery on my A603
>> board, or could it?
>>     
>
> The kernel rtc code rejects dates before the Unix epoch.  Typically an
> rtc that is reset reports a year before 1970.
>
> Andreas.
>
>   

Re: Linux on Amiga A600, a success story (in progress, with possible patch)

[Andreas Schwab]

Patrick Bottelberger <patrick.bottelberger@sigon.net> writes:

> (e.g. jumping between 02:20, 12:20 and 22:20 in a few seconds)

That looks like a real hardware problem.

> But i don't think the kernel relies on floating point registers for
> getting the time from the rtc, or is it?

The kernel does not use floating point at all.

Andreas.

-- 
Andreas Schwab, schwab@linux-m68k.org
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."

Re: Linux on Amiga A600, a success story (in progress, with possible patch)

[Patrick Bottelberger]

Hi Andreas,

On Tue, 21 Feb 2012 00:02:16 +0100, Andreas Schwab <schwab@linux-m68k.org>
wrote:
> Patrick Bottelberger <patrick.bottelberger@sigon.net> writes:
> 
>> (e.g. jumping between 02:20, 12:20 and 22:20 in a few seconds)
> 
> That looks like a real hardware problem.
> 

I am absolutely sure that it's not a hardware problem, as netbsd has no
problems reading the hardware clock.

>> But i don't think the kernel relies on floating point registers for
>> getting the time from the rtc, or is it?
> 
> The kernel does not use floating point at all.
> 

Ok, thanks for clarifying.


Regards,
Patrick

Re: Linux on Amiga A600, a success story (in progress, with possible patch)

[Geert Uytterhoeven]

On Wed, Jan 25, 2012 at 20:11, Patrick Bottelberger
<patrick.bottelberger@sigon.net> wrote:
>>> Without supplying the '-p' parameter amiboot didn't output anything at
>>> all, it just froze the amiga directly after entering the command.
>>
>> Even with '-d'?
>>
> Yes, even with "-d", no output is printed, after entering the command
> ("amiboot -d root=/dev/hda5" for example) and pressing "enter" the
> system freezes immediately.

Hmm, must be a bug in common/amiga/linuxboot.c:ckfpu(), or ckcpu346().

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds