> * Control bits in the timing register wasn't cleared properly while
> programming PIO mode.
Yep and if the BIOS programmed the slave into DMA that might not be ideal.
> * MWDMA mode programming cleared the wrong part of control bits. I
> think this can fix your problem.
Your change does nothing here.
0x0F + 1 * 0xE1 = 0xF0
It's just a construct to avoid the use of the ugly C "?" operator. The
rest of the code uses ? so the change makes sense for style, but it
doesn't appear to be a bug.
> * MWDMA mode programming cleared udma_mask even when the controller
> doesn't support UDMA. This doesn't matter for your case.
Or on the actual hardware.
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