Add comment to windows SCSI hack.

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5295 c046a42c-6fe2-441c-8c8c-71466251a162
2008-09-22 16:30:29 +00:00 · 2008-09-22 16:30:29 +00:00 · 64c68080da
parent 48d7c50f84
commit 64c68080da
1 changed files with 5 additions and 0 deletions
--- a/hw/lsi53c895a.c
+++ b/hw/lsi53c895a.c
@ -1199,6 +1199,11 @@ again:
        }
    }
    if (insn_processed > 10000 && !s->waiting) {
+        /* Some windows drivers make the device spin waiting for a memory
+           location to change.  If we have been executed a lot of code then
+           assume this is the case and force an unexpected device disconnect.
+           This is apparently sufficient to beat the drivers into submission.
+         */
        if (!(s->sien0 & LSI_SIST0_UDC))
            fprintf(stderr, "inf. loop with UDC masked\n");
        lsi_script_scsi_interrupt(s, LSI_SIST0_UDC, 0);