So here is some more information about what I am trying to do: 1. disassemble an NBI image 2. modify it 3. re-assemble it
The image I am working on is this: # disnbi myimage Type: NBI Header location: 9220:0000 Start address: 9280:0000 Flags: Vendor data: mknbi-linux-1.2-6 Segment number 1 Load address: 00092800 Image length: 4608 Memory length: 6144 Position: Absolute Vendor tag: 16 Segment number 2 Load address: 00092400 Image length: 512 Memory length: 2048 Position: Absolute Vendor tag: 17 Segment number 3 Load address: 00090000 Image length: 512 Memory length: 512 Position: Absolute Vendor tag: 18 Segment number 4 Load address: 00090200 Image length: 2560 Memory length: 40448 Position: Absolute Vendor tag: 19 Segment number 5 Load address: 00100000 Image length: 993280 Memory length: 15728640 Position: Absolute Vendor tag: 20 Segment number 6 Load address: 001f3000 Image length: 13746176 Memory length: 67108864 Position: Absolute Vendor tag: 21 Vendor data: "Vendor data in hex: 00 00 00 00 Segment number 7 Load address: 02500000 Image length: 0 Memory length: 1204 Position: Absolute Vendor tag: 22 It extracts into 6 segments that look like this: # file * nbidir: Netboot image, mode 2 segment0: DOS executable (COM) segment1: ASCII text, with no line terminators segment2: Linux x86 kernel root=0x100-ro vga=normal segment3: DOS executable (COM) segment4: data segment5: gzip compressed data, was "loopback", from Unix, last modified: Sun Oct 10 15:22:36 2010, max compression segment5 is the one I wanted to modify, its a compressed ext2 filesystem: # mv segment5 segment5.gz # gunzip segment5.gz # file segment5 segment5: Linux rev 1.0 ext2 filesystem data I mount it and modify away (small changes) # mount -t ext2 -o loop segment5 /tmp/mount I make my changes and unmount. I was not sure what all the different segments were. I thought segment2 would be the kernel, but you can see it's too small: # ls -al segment* -rw-r--r-- 1 root root 4608 Oct 10 15:22 segment0 -rw-r--r-- 1 root root 512 Oct 10 15:22 segment1 -rw-r--r-- 1 root root 512 Oct 10 15:22 segment2 -rw-r--r-- 1 root root 2560 Oct 10 15:22 segment3 -rw-r--r-- 1 root root 993280 Oct 10 15:22 segment4 -rw-r--r-- 1 root root 13746858 Oct 10 15:22 segment5 -rw-r--r-- 1 root root 0 Oct 10 15:22 segment6 It looks like segment2 segment3 and segment4 maybe make up the kernel. Not knowing what to do I combined them, and it then showed a bzip kernel type: # cat segment2 segment3 segment4 > zImage # file zImage zImage: Linux x86 kernel root=0x801-ro vga=normal, bzImage, version 2.4.20_mvl31-cpci735 (f...@and-s I saw segment1 was the parameters: # cat segment1 rw root=/dev/ram0 rdbase=0x8000000 ip=off ramdisk_size=65536 Once again, I wasn't sure exactly if I was doing this correctly but I tried to re-create the nbi image: # mknbi-linux zImage --param="rw root=/dev/ram0 rdbase=0x8000000 ip=off ramdisk_size=65536" --output=kernel /tmp/segment5 This was not successful. It produced a result of "kernel" but it was not a proper image to be booted. I am not building the NBI image file correctly and need some guidance. Can anyone direct me what I may be doing wrong? I appreciate any help anyone can give me _______________________________________________ gPXE mailing list gPXE@etherboot.org http://etherboot.org/mailman/listinfo/gpxe
