[coreboot] Data in memory changes unexpectedly ininitialize_cpus

[Marc Jones]

On Fri, Feb 12, 2010 at 4:48 PM, Marc Jones <marcj303 at gmail.com> wrote:
> On Thu, Feb 11, 2010 at 6:54 PM, Bao, Zheng <Zheng.Bao at amd.com> wrote:
>> I kept on finding the problem. Now it is narrowed down to the line 108,
>> src/arch/i386/coreboot_ram.ld. It is very, very, very, very confused.
>> My CONFIG_RAMBASE should be 0x200000, which is more than 0x100000, but
>> the location counter "." is CONFIG_STACK_SIZE. Even if I manually set
>> ". = CONFIG_STACK_SIZE * 2 ;", I can not get the correct size. But if I
>> set
>> ". = 0x2000 * 2 ;", or ". = CONFIG_STACK_SIZE << 1", it is right. I
>> kinda doubt the compiler and linker.
>>
>> Can you try it on your building machine? Just try the
>> Serengeti_cheetah_fam10 and don't need the hardware. Just check the
>> build/coreboot_ram.map to see if the _estack - _stack is multiple of
>> CONFIG_STACK_SIZE. That problem should happen on all the fam10 board if
>> it is built on my building machine.
>
> Is this due to the hard coded values in lapic_cpu_init. I don't really
> understand the comment or what it is doing. I would expect the AP
> stacks to be setup based on estack as well.
>
> // for all APs, let use stack after pgtbl, 20480 is the pgtbl size for every cpu
> stack_end = 0x100000+(20480 + CONFIG_STACK_SIZE)*CONFIG_MAX_CPUS -
> (CONFIG_STACK_SIZE*index);
>

This is what I get in my map file. It seems reasonable.

00230000 A _stack
00238000 A _estack
00238000 A _heap
002f8000 A _eheap
002f8000 A _eram_seg
01000000 A CONFIG_RAMTOP




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