search for: isolinux_start_hybrid

...ters were in reverse order. Signed-off-by: Gene Cumm <gene.cumm at gmail.com> --- mbr/isohdpfx.S | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/mbr/isohdpfx.S b/mbr/isohdpfx.S index 17e1efe..a693ccb 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) secpercyl = (stack-24) _______________________________________________ Syslinux-commits mailing list Sys...

...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) secpercyl = (stack-24) -- MartinS

...http://www.syslinux.org/commit/48e94f4fa7b3c32cbd43b6e57c64bc933f76d059 > Author: Martin Str|mberg <ams at ludd.ltu.se> ... > diff --git a/mbr/isohdpfx.S b/mbr/isohdpfx.S > index 17e1efe..a693ccb 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) > secpercyl = (stack-24) Yes. It is. However by now we know th...

...* * This doesn't follow the El Torito spec at all -- it is just a stub * loader of a hard-coded offset, but that's good enough to load * ISOLINUX. */ #define DEBUG_PRINT 1 #include "adjust.h" .code16 .text HYBRID_MAGIC = 0x7078c0fb isolinux_hybrid_signature = 0x7c00+64 isolinux_start_hybrid = 0x7c00+64+4 .globl bootsec /* Important: the top 6 words on the stack are passed to isolinux.bin */ stack = 0x7c00 partoffset = (stack-8) driveno = (stack-14) heads = (stack-16) sectors = (stack-18) ebios_flag = (stack-20) secpercyl = (stack-24) BIOS_kbdflags = 0x417 BIOS_page = 0x462 /...

Thomas Schmitt wrote: > I have some problems understanding the details of the program's flow. > > - The code inside PARTITION_SUPPORT is supposed to be inactive with > MBR isohdpfx.bin. It belongs to isohybrid --partok which is equivalent > to MBRs isohdppx*.bin. Debian uses isohdpfx.bin. Yes. isohdpfx.bin is generated from isohdpfx.S in which PARTITION_SUPPORT is not

.../ /* Get (C)HS geometry */ movb $0x08, %ah int $0x13 + + /* here we computer CHS values or just do some dummy computation for EBIOS */ andw $0x3f, %cx /* Sector count */ popw %bx /* EBIOS flag */ pushw %cx /* -16: Save sectors on the stack */ @@ -223,9 +257,15 @@ next: ljmpw $0, $isolinux_start_hybrid bad_signature: - call error + call print_string .ascii "isolinux.bin missing or corrupt.\r\n" +boot_failure: + int $0x18 /* Boot failure */ +die: + hlt + jmp die + /* * read_sector: read a single sector pointed to by %eax to %es:%bx. * CF is set on error. All registers saved...

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,

Hi, C/H/S addressing and reading of first block seems to be ok in isohdpfd.bin. The main suspect for the failure of the attempt with isohdpfd.bin is the number or content of the blocks read after the first one. But i have no clue why isohdpfc.bin should do better than isohdpfd.bin. They differ just by one instruction (JC = 0x72 versus JMP = 0xEB) which both are performed before the reading and

...s "8f 06 28 30 2e" and "8f 06 2a 30 5a" near byte position 64 of isolinux.bin : fb c0 78 70 59 2e 8f 06 28 30 2e 8f 06 2a 30 5a given that isohdpfx.S has: HYBRID_MAGIC = 0x7078c0fb isolinux_hybrid_signature = 0x7c00+64 isolinux_start_hybrid = 0x7c00+64+4 (One may guess that i will propose to patch the ISO at byte 8444*512+70, if i get a "yes" on this question.) --------------------------------------------------------------------- If this is indeed the wrong sequence in isolinux.bin then the riddle arises why th...