Fri, 12 Apr 2013 12:34:32 +0100
Fix read-after-write logic
In some cases (notably reading from a page after having written to it), the
mapper may change the pagestate from "accessed and written" ("dirty"; PS0,PS1)
to "accessed but not written" (clean; PS1,!PS0). This should never, ever, EVER
happen. Once a page is dirty, it remains so until the 68k clears the DIRTY
bit.
Once again, this wonderful bit of logic was missing from the TRM.
| philpem@131 | 1 | TODO -- things to check |
| philpem@131 | 2 | |
| philpem@131 | 3 | * Realtime clock |
| philpem@131 | 4 | * WD2010 command handler logic |
| philpem@131 | 5 | * Disabling page write protect logic allows userspace to run up but HDD won't mount |
| philpem@131 | 6 | * DMA Page Fault issues (see wd2010.c and test code) |