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32x, hacks for roms with caching related problems

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This commit is contained in:
kub 2022-12-20 21:32:24 +00:00
parent ebd9c86a6c
commit fe8f2d963e
7 changed files with 89 additions and 28 deletions
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10
pico/32x/sh2soc.c
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@ -137,15 +137,7 @@ static void dmac_memcpy(struct dma_chan *chan, SH2 *sh2)
if (!up || chan->tcr < 4)
return;
#if MARS_CHECK_HACK
// XXX Mars Check Program copies 32K longwords (128KB) from a 64KB buffer in
// ROM or DRAM to SDRAM in 4-longword mode, overwriting an SDRAM comm area in
// turn, which crashes the test on emulators without CPU cache emulation.
// This may be a bug in Mars Check. As a kludge limit the transfer to 64KB,
// which is what the check program test uses for checking the result.
// A better way would clearly be to have a mechanism to patch the ROM...
if (size == 3 && chan->tcr == 32768 && chan->dar == 0x06020000) size = 1;
#endif
if (size == 3) size = 2; // 4-word xfer mode still counts in words
// XXX check TCR being a multiple of 4 in 4-word xfer mode?
// XXX check alignment of sar/dar, generating a bus error if unaligned?