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");
Regards
dave
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