[coreboot] Data in memory changes unexpectedly ininitialize_cpus

[Marc Jones]

2010/2/12 Zheng Bao <fishbaoz at hotmail.com>:
>
>
>> Date: Fri, 12 Feb 2010 16:54:43 -0700
>> From: marcj303 at gmail.com
>> To: Zheng.Bao at amd.com
>> CC: coreboot at coreboot.org
>> Subject: Re: [coreboot] Data in memory changes unexpectedly
>> ininitialize_cpus
>>
>> 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
>>
> what is the CONFIG_STACK_SIZE in your map file?

00008000 A CONFIG_STACK_SIZE

I buillt svn head of serengeti_cheetah_fam10.

Marc

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