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Use 512k+512k memory spilt for CS8220 chipset

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Use 512k base memory for CS8220 chipset if memory larger than 640k, fix some BIOS not recognizing extended memory.
This commit is contained in:
WNT50
2025-11-09 17:24:49 +08:00
parent 39e0fef5de
commit 860739f8bd
1 changed files with 9 additions and 19 deletions
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28
src/chipset/cs8220.c
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@@ -218,38 +218,28 @@ cs8220_init(UNUSED(const device_t *info))
dev->ram_banks[0].virt = 0x00000000;
dev->ram_banks[0].phys = 0x00000000;
dev->ram_banks[0].size = 0x00080000;
dev->ram_banks[1].virt = 0x00080000;
dev->ram_banks[1].phys = 0x00080000;
dev->ram_banks[1].size = 0x00020000;
/* Pretend there's a 128k expansion. */
dev->ram_banks[2].virt = 0x00100000;
dev->ram_banks[2].phys = 0x00080000;
dev->ram_banks[2].size = 0x00020000;
break;
case 896:
dev->ram_banks[0].virt = 0x00000000;
dev->ram_banks[0].phys = 0x00000000;
dev->ram_banks[0].size = 0x00080000;
dev->ram_banks[1].virt = 0x00080000;
dev->ram_banks[1].phys = 0x00080000;
dev->ram_banks[1].size = 0x00020000;
/* Pretend there's a 256k expansion. */
dev->ram_banks[2].virt = 0x00100000;
dev->ram_banks[2].phys = 0x00080000;
dev->ram_banks[2].size = 0x00040000;
break;
case 1024:
case 896:
dev->ram_banks[0].virt = 0x00000000;
dev->ram_banks[0].phys = 0x00000000;
dev->ram_banks[0].size = 0x00080000;
dev->ram_banks[1].virt = 0x00080000;
dev->ram_banks[1].phys = 0x00080000;
dev->ram_banks[1].size = 0x00020000;
/* Pretend there's a 384k expansion. */
dev->ram_banks[2].virt = 0x00100000;
dev->ram_banks[2].phys = 0x00080000;
dev->ram_banks[2].size = 0x00060000;
break;
case 1024:
dev->ram_banks[0].virt = 0x00000000;
dev->ram_banks[0].phys = 0x00000000;
dev->ram_banks[0].size = 0x00080000;
dev->ram_banks[1].virt = 0x00100000;
dev->ram_banks[1].phys = 0x00080000;
dev->ram_banks[1].size = 0x00080000;
break;
}
mem_set_mem_state(0x00000000, (mem_size << 10) + 0x00060000, MEM_READ_EXTANY | MEM_WRITE_EXTANY);