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SubjectRe: [sodaville] [PATCH] x86/trampoline: fallback to fixed trampoline address if no e820 map is provided
On 12/23/2010 05:16 AM, Yinghai wrote:
> On Dec 23, 2010, at 1:57 AM, Florian Fainelli <> wrote:
>> On Tuesday 14 December 2010 22:19:39 Florian Fainelli wrote:
>>> From: Florian Fainelli <>
>>> Since 893f38d1 (x86: Use find_e820() instead of hard coded trampoline
>>> address), the trampoline base address should be provided by the BIOS as an
>>> e820 area. Some minimalistic BIOSes (like CEFDK on CE4100) may not provide
>>> any e820 area, still we should fallback to a fixed trampoline base address
>>> for SMP to work correctly.
> No e820 memmap ?
> Not sure how does it work
> Do you have boot log with debug ?
> Also recent kernel is using memblock already for finding free area.

OK, this deeply troubles me. This is clearly not the right approach
here... the memory map should be fed to the kernel, this has been a
requirement all along, and Linus has very deliberately not agreed to
exceptions (and I agree with that stance.)

So this patch is a non-starter... I presume the memory map is being
provided in through the device (which means it should be fed into
memblock in current kernels, although the ordering may need to be tweaked?)


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