[U-Boot] [OT]Need help getting Linux past init

[Detlev Zundel <dzu@denx.de>]

Hi Graeme,

> Hi All,
>
> I know this post is off topic - I you can point me to a better target
> audience (except LKML - they are somewhat reserved about requests for help
> ;) please let me know. That said, here goes...
>
> I now have U-Boot (x86 port) fully capable of booting a Linux kernel
> (2.6.33). I downloaded Buildroot and built a JFFS2 image and after a lot of
> mucking around, finally got U-Boot to ls it and the Linux Kernel to mount it.

Congratulations!

> My Linux kernel command line is:
>
> console=ttyS0,115200 noinitrd rw root=/dev/mtdblock0 rootfstype=jffs2
> init=/bin/sh
>
> I've added a few debug lines in Linux. The last lines of the boot process
> are as follows:
>
> [    1.340905] Serial: 8250/16550 driver, 4 ports, IRQ sharing disabled
> [    1.343423] serial8250: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
> [    1.345935] serial8250: ttyS1 at I/O 0x2f8 (irq = 3) is a 16550A
> [    1.396891] brd: module loaded
> [    1.422898] loop: module loaded
> [    1.426898] Serck eNET flash device: 0x1000000 at 0x11000000
> [    1.436921] Serck eNET Flash Bank #0: Found 1 x16 devices at 0x0 in
> 16-bit bank
> [    1.438291]  Intel/Sharp Extended Query Table at 0x0031
> [    1.439291]  Intel/Sharp Extended Query Table at 0x0031
> [    1.440557] Using buffer write method
> [    1.441575] cfi_cmdset_0001: Erase suspend on write enabled
> [    1.449905] 8139too Fast Ethernet driver 0.9.28
> [    1.460851] eth0: RealTek RTL8139 at 0x2000, 00:40:f4:6e:67:ac, IRQ 10
> [    1.472862] eth1: RealTek RTL8139 at 0x2100, 00:40:f4:6e:67:ac, IRQ 9
> [    1.475904] rtc_cmos rtc_cmos: rtc core: registered rtc_cmos as rtc0
> [    1.479905] rtc-test rtc-test.0: rtc core: registered test as rtc0
> [    1.482905] rtc-test rtc-test.1: rtc core: registered test as rtc1
> [    1.498879] TCP cubic registered
> [    1.505900] rtc-test rtc-test.0: setting system clock to 2010-03-24
> 02:12:31 UTC (1269396751)
> [    1.584915] VFS: Mounted root (jffs2 filesystem) on device 31:0.
> [    1.587000] Freeing unused kernel memory: 168k freed
> [    1.591853] Call mark_rodata_ro()
> [    1.595840] Write protecting the kernel text: 2660k
> [    1.598100] Write protecting the kernel read-only data: 772k
> [    1.598880] Set system_state = SYSTEM_RUNNING
> [    1.600505] Call numa_default_policy()
> [    1.601504] Opening /dev/console
> [    1.612898] Set current->signal->flags |= SIGNAL_UNKILLABLE
> [    1.614104] run_init_process(/bin/sh)
> [    1.615189] sys_execve()
> [    1.616189] do_execve()
> [    1.816894] execve succeeded
>
> So it looks like the kernel has no problem locating /bin/sh in the JFFS2
> partition but then the lights go out. I've also tried /bin/init - same result.

Hm.  Can you try the filesystem on another x86 platform with a working
kernel?  If I have problems like this, I usually try to boot into a
working filesystem, mount the filesystem in questino and try a chroot
into it.  Unfortunately this is not applicable for you.

You may try to link /bin/sh statically.  Maybe the dynamic linker has a
problem?

> I even tried changing /dev/console to be a symlink to /dev/ttyS0 but that
> didn't change a thing.
>
> I am _SO_ close to getting this going, and after all the work I have put
> into U-Boot to get this far, it is really frustrating.

As you have come this far, I don't see how you can be stopped ;)

Cheers
  Detlev

-- 
Old mathematicians never die; they just lose some of their functions.
--
DENX Software Engineering GmbH,      MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich,  Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-40 Fax: (+49)-8142-66989-80 Email: dzu at denx.de