search for: 6d8ab36

...ons Thomas, you've found the bug! Very well done. Thank you. Changing the code to sectors = (stack-16) heads = (stack-18) lets my always fail EBIOS detection version to boot the iso. Please David if you see this, try this. Patch: diff --git a/mbr/isohdpfx.S b/mbr/isohdpfx.S index 6d8ab36..5a8b267 100644 --- a/mbr/isohdpfx.S +++ b/mbr/isohdpfx.S @@ -48,8 +48,8 @@ isolinux_start_hybrid = 0x7c00+64+4 stack = 0x7c00 partoffset = (stack-8) driveno = (stack-14) -heads = (stack-16) -sectors = (stack-18) +sectors = (stack-16) +heads = (stack-18) ebios_flag = (stack-20) secpercy...

...0-9a-z]/) { $maxsize = $padsize = 439; diff --git a/mbr/isohdpfv.S b/mbr/isohdpfv.S new file mode 100644 index 0000000..46c9c07 --- /dev/null +++ b/mbr/isohdpfv.S @@ -0,0 +1,3 @@ +#define DEBUG_PRINT 1 +#include "isohdpfx.S" + diff --git a/mbr/isohdpfx.S b/mbr/isohdpfx.S index 17e1efe..6d8ab36 100644 --- a/mbr/isohdpfx.S +++ b/mbr/isohdpfx.S @@ -121,10 +121,24 @@ _start: /* We have GPT partition information */ movl (32+20)(%si), %ecx movl (36+20)(%si), %ebx + +#ifdef DEBUG_PRINT + push %si + call print_string + .ascii "G\r\n" + pop %si +#endif jmp 1f /* We have non-...

Hi, given the fact that the conversion has the factor HC*SH = "secpercyl", which is invariant under swapping, there remains as suspect in read_sector_cbios only this division: divb (sectors) There is a suspicious discrepancy in the code: heads = (stack-16) sectors = (stack-18) ... /* here we computer CHS values or just do some dummy computation for EBIOS */ andw $0x3f,