How can I support 2GB of memory in Linux kernel on 440SPe

How can I support 2GB of memory in Linux kernel on 440SPe

[Vincitore]

Hi,

I need to support 2GB of memory on a custom 440SPe board.

I see to support 1GB of memory on the 440SPe yucca board the following
configuration changes were done.

#
# Advanced setup
#

CONFIG_ADVANCED_OPTIONS=y
CONFIG_HIGHMEM_START=0xfe000000
CONFIG_LOWMEM_SIZE_BOOL=y
CONFIG_LOWMEM_SIZE=0x40000000
CONFIG_KERNEL_START_BOOL=y
CONFIG_KERNEL_START=0xa0000000
# CONFIG_TASK_SIZE_BOOL is not set
CONFIG_TASK_SIZE=0x80000000
# CONFIG_CONSISTENT_START_BOOL is not set CONFIG_CONSISTENT_START=0xff100000
# CONFIG_CONSISTENT_SIZE_BOOL is not set
CONFIG_CONSISTENT_SIZE=0x00200000 # CONFIG_BOOT_LOAD_BOOL is not set
CONFIG_BOOT_LOAD=0x01000000

It looks like the only thing I would need to do is modify the
following for 2GB support.

CONFIG_LOWMEM_SIZE=0x80000000
and
CONFIG_KERNEL_START=0x60000000

But this does not work. It almost does, but right after I get to the
Linux prompt, this system panics. If I scale back to one 1GB
everything works great.

Any ideas?

Thank You,

Vincitore

RE: How can I support 2GB of memory in Linux kernel on 440SPe

[Rune Torgersen]

> From: linuxppc-embedded-bounces+runet=3Dinnovsys.com@ozlabs.org=20
> [mailto:linuxppc-embedded-bounces+runet=3Dinnovsys.com@ozlabs.or
> g] On Behalf Of Vincitore
> Sent: Friday, December 28, 2007 8:00 AM
> To: linuxppc-embedded@ozlabs.org
> Subject: How can I support 2GB of memory in Linux kernel on 440SPe
>=20
> Hi,
>=20
> I need to support 2GB of memory on a custom 440SPe board.
>=20
> I see to support 1GB of memory on the 440SPe yucca board the following
> configuration changes were done.

Just leave the configuration for 1 GB, and enable CONFIG_HIGHMEM
That gives you 2 (or more) GB of RAM, with 1G as lowmwm.

Re: How can I support 2GB of memory in Linux kernel on 440SPe

[Vincitore]

Hi Rune,

I tried what you suggested. With no luck.

I enabled CONFIG_HIGHMEM=y

Now I panic when  when unpacking_rootfs.

...
Memory: 2076148k available (2160k kernel code, 764k data, 144k init,
1048572k highmem)
Mount-cache hash table entries: 512
checking if image is initramfs...Oops: kernel access of bad area, sig: 11 [#1]
NIP: A02A9618 LR: A02A9598 CTR: A002EAE8
REGS: dfc01e60 TRAP: 0300   Not tainted  (2.6.19.2)
MSR: 00029000 <EE,ME>  CR: 24000084  XER: 00000000
DAR: 1FDEA000, DSISR: 00000000
TASK = a13e4ba0[1] 'swapper' THREAD: dfc00000
GPR00: 00000000 DFC01F10 A13E4BA0 DFC10000 000000D0 00000001 2D89B700 A02C0000
GPR08: DFC01D18 A02C0000 00000000 A02C3F78 24000084 70000000 A02D0000 00000000
GPR16: 00000001 00800000 7FFFF0FC 00000000 A02C0000 A02C0000 7FFEE61C 00000001
GPR24: 00000000 007FFE70 00000D80 00184F9D 1FDEA000 A02D0000 A00012F8 A02D0000
NIP [A02A9618] unpack_to_rootfs+0xdc/0xa54
LR [A02A9598] unpack_to_rootfs+0x5c/0xa54
Call Trace:
[DFC01F10] [A02A9598] unpack_to_rootfs+0x5c/0xa54 (unreliable)
[DFC01F60] [A02AA050] populate_rootfs+0x7c/0x104
[DFC01F80] [A0001328] init+0x30/0x2a4
[DFC01FF0] [A00047E0] kernel_thread+0x44/0x60
Instruction dump:
912b0000 3ce0a02c 3d20a02c 914b0004 90074038 90093f8c 3ce0a02c 80074038
2f800000 409e0054 2f9b0000 419e004c <881c0000> 39753f78 2f800030 82cb0000

This is the same if I have CONFIG_HIGHMEM disabled. The only
difference is highmem now shows up as 0k.

Memory: 2076148k available (2160k kernel code, 764k data, 144k init, 0k highmem)
Mount-cache hash table entries: 512
checking if image is initramfs...Oops: kernel access of bad area, sig: 11 [#1]
...


Vincitore

On 12/28/07, Rune Torgersen <runet@innovsys.com> wrote:
> > From: linuxppc-embedded-bounces+runet=innovsys.com@ozlabs.org
> > [mailto:linuxppc-embedded-bounces+runet=innovsys.com@ozlabs.or
> > g] On Behalf Of Vincitore
> > Sent: Friday, December 28, 2007 8:00 AM
> > To: linuxppc-embedded@ozlabs.org
> > Subject: How can I support 2GB of memory in Linux kernel on 440SPe
> >
> > Hi,
> >
> > I need to support 2GB of memory on a custom 440SPe board.
> >
> > I see to support 1GB of memory on the 440SPe yucca board the following
> > configuration changes were done.
>
> Just leave the configuration for 1 GB, and enable CONFIG_HIGHMEM
> That gives you 2 (or more) GB of RAM, with 1G as lowmwm.
>

Re: How can I support 2GB of memory in Linux kernel on 440SPe

[Vincitore]

Hi Michele,

I also tried this and it did not work. It also panics while unpacking rootfs

Onced your system is up do you see all of the 2GB of Memory.

# cat /proc/meminfo

Thank You,

Vincitore


On 12/28/07, Michele Pallaro <michele.pallaro@alcatel-lucent.it> wrote:
> CONFIG_ADVANCED_OPTIONS=y
> # CONFIG_HIGHMEM_START_BOOL is not set
> CONFIG_HIGHMEM_START=0xfe000000
> # CONFIG_LOWMEM_SIZE_BOOL is not set
> CONFIG_LOWMEM_SIZE=0x30000000
> CONFIG_KERNEL_START_BOOL=y
> CONFIG_KERNEL_START=0x80000000
> # CONFIG_TASK_SIZE_BOOL is not set
> CONFIG_TASK_SIZE=0x80000000
>
> I use ppc 8555E with 2G
>
> Michele
>
>
> Vincitore wrote:
> > Hi,
> >
> > I need to support 2GB of memory on a custom 440SPe board.
> >
> > I see to support 1GB of memory on the 440SPe yucca board the following
> > configuration changes were done.
> >
> > #
> > # Advanced setup
> > #
> >
> > CONFIG_ADVANCED_OPTIONS=y
> > CONFIG_HIGHMEM_START=0xfe000000
> > CONFIG_LOWMEM_SIZE_BOOL=y
> > CONFIG_LOWMEM_SIZE=0x40000000
> > CONFIG_KERNEL_START_BOOL=y
> > CONFIG_KERNEL_START=0xa0000000
> > # CONFIG_TASK_SIZE_BOOL is not set
> > CONFIG_TASK_SIZE=0x80000000
> > # CONFIG_CONSISTENT_START_BOOL is not set CONFIG_CONSISTENT_START=0xff100000
> > # CONFIG_CONSISTENT_SIZE_BOOL is not set
> > CONFIG_CONSISTENT_SIZE=0x00200000 # CONFIG_BOOT_LOAD_BOOL is not set
> > CONFIG_BOOT_LOAD=0x01000000
> >
> > It looks like the only thing I would need to do is modify the
> > following for 2GB support.
> >
> > CONFIG_LOWMEM_SIZE=0x80000000
> > and
> > CONFIG_KERNEL_START=0x60000000
> >
> > But this does not work. It almost does, but right after I get to the
> > Linux prompt, this system panics. If I scale back to one 1GB
> > everything works great.
> >
> > Any ideas?
> >
> > Thank You,
> >
> > Vincitore
> > _______________________________________________
> > Linuxppc-embedded mailing list
> > Linuxppc-embedded@ozlabs.org
> > https://ozlabs.org/mailman/listinfo/linuxppc-embedded
> >
>
>