when testing USB support for DOS
with USBASPI.SYS and DI1000DD.SYS, the kernel simply crashed.
the patch below helps.
for unknown reasons, the temp_buff is required; using
deblock_buff instead of temp_buff doesn't work.
now my notebook happily detects and uses my USB drive :))
STATIC int rqblockio(unsigned char command, struct dpb FAR * dpbp)
{
retry:
MediaReqHdr.r_length = sizeof(request);
MediaReqHdr.r_unit = dpbp->dpb_subunit;
MediaReqHdr.r_command = command;
MediaReqHdr.r_mcmdesc = dpbp->dpb_mdb;
MediaReqHdr.r_status = 0;
+ if (command == C_BLDBPB)
+ {
+ static char temp_buff[512];
+ MediaReqHdr._r_x._r_bpb._r_fat = (boot FAR *)&temp_buff;
+ }
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