Messages in this thread | | | Date | Thu, 1 Nov 2007 10:50:36 +0000 | From | Alan Cox <> | Subject | Re: "Fix ATAPI transfer lengths" causes CD writing regression |
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O> Hmmm.... reading ide-cd.c::cdrom_pc_intr(). OIC, ide-cd is dealing with > this problem by draining PIO after BMDMA engine is done. This is > possible for BMDMA engines as they simply step out when the SG entries > are exhausted; then, the interrupt handler kicks in and drains the > left-over using PIO. This just isn't possible with more modern DMA engines.
Its not possible with old ones either - its a bug not a feature and is why there is special casing for stuff like promise where this hangs the chip.
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