I finally managed to compile older kernels, and I found that
2.5.27 (and 2.4.19-rc1 and 2.5.26) works fine (modulo endless loop
in ide_do_request... but it takes at least 5 minutes to trigger it),
while 2.5.28 dies in one second with UDMA status 0x25 (irq requested,
transfer in progress) and IDE status 0x58 (drq asserted).
Because of only change in IDE system between 2.5.27 and 2.5.28 is
renaming __save_flags => local_save_flags, fixing get_request for
ioctl commands (so 2.5.28 should be correct while 2.5.27 is not),
and moving some ioctls around, it looks like that problem is triggered
by something else.
I currently suspect IRQ handling changes, but maybe someone has
better idea? Also, I cannot reproduce problem with Seagate UDMA66
drive switched to UDMA33 mode, so it looks like that problem is
timming/firmware (Toshiba MK6409MAV) dependent.
And I did all these tests with UP kernel, just to eliminate cli/sti
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