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...Dwords],eax ; boot file dwords > add eax,(2047 >> 2) > shr eax,9 ; dwords->sectors > mov [ImageSectors],ax ; boot file sectors 319,365d326 < ;DEB -- Patch to have code actually insert values for bi_file and bi_length < mov bx, trackbuf ;DEB < mov eax, 17 ;DEB Location of Boot Record Volume < call getonesec ;DEB Retrieve Boot Record Volume < < mov eax, dword [trackbuf+47h]...

...------------------------------------------ The format of this table is as follows; all integers are in section 7.3.1 ("little endian") format. Offset Name Size Meaning 8 bi_pvd 4 bytes LBA of primary volume descriptor 12 bi_file 4 bytes LBA of boot file 16 bi_length 4 bytes Boot file length in bytes 20 bi_csum 4 bytes 32-bit checksum 24 bi_reserved 40 bytes Reserved The 32-bit checksum is the sum of all the 32-bit words in the boot f...

Hi, Ady wrote: > This is a quote from Wonko/Jaclaz, who has also been investigation this > issue and deserves credit for it: > Ok, not that I understand the code, but what *somehow* happens is that > the "embedded" checksum in Isolinux.bin (starting from 4.00) is the > checksum of the WHOLE file (i.e. starting from offset 0 instead of 64) > at a time when: > 1)

This patch introduces extra functionality to chain.c, mainly with reference to BPB adjustments, but not only that. It expects 3 small patches I sent earlier (they are included for easy reference, patches 1-3/4). The changes introduced are: 1) file and boot sector use separate options to control load address and jump address (if applicable). Options are as described below: *