[syslinux] pxelinux bug's

[Iouri Kharon]

   Hi H.!

Thursday, June 21, 2007, you wrote:

HPA> Could you be a bit more explicit what you mean with "he alignment of the
HPA> last disk is discarded in calculations but is ALWAYS present when the
HPA> loading procedure is called"?

Reference linenumber in 3.51 (runkernel.inc)

line 603 ('alignment discarded for last disk'; last(in mem) = first loaded):

                       cmp dword [es:su_ramdisklen], 0
                       je .nopadding
                       add ecx,4095
                       and cx,0F000h
.nopadding


line 617 ('ALWAYS present when called'):
                       mov dx,0FFFh
                       mov bx,load_dot
                       call load_high

:)
When load second disk, first disk aligned in load_high, but it size was not aligned
in line 603.

-----------------
Why align to page (not dword)? If see in linux/init/initramfs.c:unpack_to_rootfs()

          while(...) {
             if (*buf == '0' && !(this_header & 3)) { // e.g. aligned to 32bit
             .....
             }
             if (!*buf) {
               ++buf;
               --len;
               ++this_header;
               continue;
             }
             // unpack and/or load cpio-archieve UNALIGNED
             
?


Best regards,
 Iouri                            mailto:bc-info at styx.cabel.net