Re: [Fastboot] [CFT] ELF Relocatable x86 and x86_64 bzImages

From: H. Peter Anvin
Date: Mon Jul 31 2006 - 22:33:06 EST

Eric W. Biederman wrote:

Ok. I am decompressing the kernel to 16MB and after reducing 1MB of
CONFIG_PHYSICAL_START I am left with 15MB which is not 4M aligned
hence I seems to be running into it.

I changed it to

if ((u32)output) & 0x3fffff)

and kdump kernel booted fine. But this will run into issues if I load
kernel at 1MB.

I got a dump question. Why do I have to load the kernel at 4MB alignment?
Existing kernel boots loads at 1MB, which is non 4MB aligned and it works

4MB is a little harsh, but I haven't worked through what the exact rules
are, I know 4MB is the worst case alignment for arch/i386.

4 MB would be worst case for i386; 2 MB for x86-64. Actually the x86-64 worst case would be gigabyte, but that's more than a little bit extreme.

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