Messages in this thread Patch in this message | | | Date | Tue, 22 May 2007 02:14:22 +0000 | From | "young dave" <> | Subject | Re: 2.6.22-rc1-mm1 |
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Hi, > This implies a miscompile somewhere, *or* that your bios stomps on > registers that gcc expect preserved, and adding printf's disturbs the > register allocation sufficiently.
I think maybe it's caused by gcc optimize, so I add volatile to read_sector inline assemblly, then kernel can boot successfully.
please check this patch :
diff -ur linux/arch/i386/boot/edd.c linux.new/arch/i386/boot/edd.c --- linux/arch/i386/boot/edd.c 2007-05-22 10:08:59.000000000 +0000 +++ linux.new/arch/i386/boot/edd.c 2007-05-22 10:06:24.000000000 +0000 @@ -47,7 +47,7 @@ ax = 0x4200; /* Extended Read */ si = (size_t)&dapa; dx = devno; - asm ("pushfl; stc; int $0x13; setc %%al; popfl" + asm volatile("pushfl; stc; int $0x13; setc %%al; popfl" : "+a" (ax), "+S" (si), "+d" (devno) : : "ebx", "ecx", "edi");
@@ -58,7 +58,7 @@ cx = 0x0001; /* Sector 0-0-1 */ dx = devno; bx = (size_t)buf; - asm ("pushfl; stc; int $0x13; setc %%al; popfl" + asm volatile("pushfl; stc; int $0x13; setc %%al; popfl" : "+a" (ax), "+c" (cx), "+d" (dx), "+b" (bx) : : "esi", "edi");
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