On Thursday 19 May 2011 22:07:35 Jedrzej Kalinowski wrote: > Maybe just some hint on how to debug it further or how can I find some > workaround?
The bisection result doesn't make much sense to me. If I had your system in front of me, I would probably approach this by dumping out memory contents, register values, etc, to find out how a straightforward memcpy()-equivalent in pxeprefix.S is somehow copying zeroes. Before the jump to .text16 in pxeprefix.S (i.e. before the comment "/* Jump to .text16 segment... */"), you can call the debugging routines in libprefix.S to dump out values. For example, to print out the address and contents of preloaded_undi immediately after the copy: pushl %eax xorw %di, %di movw %es, %ax /* Print segment:offset address for preloaded_undi */ call print_hex_word movw $preloaded_undi, %ax call print_hex_word movl (preloaded_undi+0), %eax /* Print contents of preloaded_undi */ call print_hex_dword movl (preloaded_undi+4), %eax call print_hex_dword movl (preloaded_undi+8), %eax call print_hex_dword ... popl %eax Michael _______________________________________________ ipxe-devel mailing list [email protected] https://lists.ipxe.org/mailman/listinfo/ipxe-devel
