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Point here probably is that the board's BIOS runs the CDROM drive in a slower transfer mode than Linux is trying to do. Typically, CDROM boot is performed using some kind of PIO mode, while modern Linux distros try to auto-setup a suitable DMA mode. There aren't exactly few IDE CDROMs that screw up in DMA modes. You need to use the "idedma=" kernel parameter on bootup for those.
regards, Peter
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