[ECOS] IXDP425 SDRAM CONFIG & Linux ATAGS
Dave
dave@cc0.net
Wed Oct 5 18:27:00 GMT 2005
Hello all,
Following up on the issue I originally reported. I dug into the issue more
and I just cannot see anything that I am missing. The memory looks correct
between a working 64mb configuration and a 32mb configuration...however
ATAGS are still not usable on the 32mb configuration.
The issue as originally reported is that I have a 64mb IXDP425 board with
RedBoot 2.01 which works fine with a 2.4.27 kernel. ATAGS work correctly, I
can override the kernel command line just fine via exec -c "". I have a 32mb
IXDP425 board with the same RedBoot 2.01 except that changes have been made
to reflect the SDRAM memory layout and size. Also adjusted are the mlt files
in pkgconf/. The ATAGS on the 32mb board look fine in memory after calling
exec -c "" however the 2.4.27 kernel thinks they are somewhere else than on
the 64mb board. The kernel being used is identical for both the 32mb and
64mb boards.
I placed a memory dump in redboot after exec but before kernel exec and the
ATAGS can be seen just fine on both 32 and 64. I also placed some printks in
the kernel to show ATAG stuff and it is different between the 64/32.
The changes made to the RedBoot source as well as the memory dump and kernel
printks I placed at:
http://ixp.cc0.net/
To save forwarding all this info to the mailing list.
Anyone have an idea what I am missing that needs to be changed?
Thanks!
-Dave
> On Wednesday 28 September 2005 02:54 am, Dave wrote:
>> I just dug into this today...I put a dump in redboot_linux_exec.c after
>> filling up the ATAGs and before executing kernel and looked at memory at
>> 0x100. It looks perfect to me...ATAGs present are ATAG_CORE, ATAG_MEM and
>> ATAG_CMDLINE.
>
> Dump the value of
> CYGARC_PHYSICAL_ADDRESS(CYGHWR_REDBOOT_ARM_LINUX_TAGS_ADDRESS)
>
> This is the value that should be in your linux's machine_desc.boot_params
>
> Jon
>
> --
> Before posting, please read the FAQ: http://ecos.sourceware.org/fom/ecos
> and search the list archive: http://ecos.sourceware.org/ml/ecos-discuss
>
>
--
Before posting, please read the FAQ: http://ecos.sourceware.org/fom/ecos
and search the list archive: http://ecos.sourceware.org/ml/ecos-discuss
More information about the Ecos-discuss
mailing list