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The Cirrus Logic graphics cards now correctly disable MMIO if bit 0 of sequencer register 7 is clear, fixes #352.

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This commit is contained in:
OBattler
2019-09-29 17:45:29 +02:00
parent 33094a164d
commit ce907f89e3
1 changed files with 2 additions and 2 deletions
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4
src/video/vid_cl54xx.c
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@@ -914,7 +914,7 @@ gd543x_recalc_mapping(gd54xx_t *gd54xx)
gd54xx->mmio_vram_overlap = 0;
if (!gd54xx_is_5422(svga) || !(svga->seqregs[7] & 0xf0)) {
if (!gd54xx_is_5422(svga) || !(svga->seqregs[7] & 0xf0) || !(svga->seqregs[0x07] & 0x01)) {
mem_mapping_disable(&gd54xx->linear_mapping);
mem_mapping_disable(&gd54xx->aperture2_mapping);
switch (svga->gdcreg[6] & 0x0c) {
@@ -936,7 +936,7 @@ gd543x_recalc_mapping(gd54xx_t *gd54xx)
gd54xx->mmio_vram_overlap = 1;
break;
}
if (svga->seqregs[0x17] & CIRRUS_MMIO_ENABLE) {
if ((svga->seqregs[0x17] & CIRRUS_MMIO_ENABLE) && (svga->seqregs[0x07] & 0x01)) {
if (gd54xx->mmio_vram_overlap) {
mem_mapping_disable(&svga->mapping);
mem_mapping_set_addr(&gd54xx->mmio_mapping, 0xb8000, 0x08000);