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    SubjectRe: 2.6.21-rc5-mm3 - no boot, "address not 2M aligned"
    On Mon, Apr 02, 2007 at 01:17:45PM +0200, thunder7@xs4all.nl wrote:
    [..]
    > > + /*
    > > + * Make sure kernel is aligned to 2MB address. Catching it at compile
    > > + * time is better. Change your config file and compile the kernel
    > > + * for a 2MB aligned address (CONFIG_PHYSICAL_START)
    > > + */
    > > + BUILD_BUG_ON(ALIGN(CONFIG_PHYSICAL_START, __KERNEL_ALIGN)
    > > + != CONFIG_PHYSICAL_START);
    > > +
    > > /* clear bss before set_intr_gate with early_idt_handler */
    > > clear_bss();
    > >
    > > diff -puN include/asm-x86_64/page.h~x86_64-check-for-config-physical-start-aligned-2M include/asm-x86_64/page.h
    > > --- linux-2.6.21-rc5-mm3-vanilla/include/asm-x86_64/page.h~x86_64-check-for-config-physical-start-aligned-2M 2007-04-02 20:50:55.000000000 +0530
    > > +++ linux-2.6.21-rc5-mm3-vanilla-root/include/asm-x86_64/page.h 2007-04-02 20:51:34.000000000 +0530
    > > @@ -79,6 +79,7 @@ extern unsigned long phys_base;
    > > #endif /* !__ASSEMBLY__ */
    > >
    > > #define __PHYSICAL_START CONFIG_PHYSICAL_START
    > > +#define __KERNEL_ALIGN 0x200000
    > > #define __START_KERNEL (__START_KERNEL_map + __PHYSICAL_START)
    > > #define __START_KERNEL_map 0xffffffff80000000
    > > #define __PAGE_OFFSET 0xffff810000000000
    > > _
    >
    > I'm only a user, so I'm not uptodate on these addresses and how they
    > work. However, how does this solve the problem that running
    >
    > make oldconfig
    >
    > on a working 2.6.21-rc3-mm2 .config gives an unbootable 2.6.21-rc5-mm3
    > kernel? If I read things correctly, you now get a BUG, but the kernel
    > still won't boot. If that is correct, than I, as a user, don't think
    > that this is the solution that I feel comfortable with.
    >

    You will get a compile time error and your compilation will not be
    through if your physical address is not 2MB aligned. Just give it a try.

    Thanks
    Vivek
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