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Xi 8088: add the UMB dip switch and allow the programming of the BIOS flash memory
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This commit is contained in:
pcem-maintainer 2021-07-04 18:32:57 -03:00
commit 78d0618363
5 changed files with 118 additions and 20 deletions
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64
src/sst39sf010.c
View file

@ -3,6 +3,7 @@
#include "device.h"
#include "mem.h"
#include "sst39sf010.h"
#include "xi8088.h"
typedef struct sst_t
{
@ -25,6 +26,18 @@ typedef struct sst_t
static void set_id_mode(sst_t *sst);
static void clear_id_mode(sst_t *sst);
static uint32_t sst_masked_rom_addr(uint32_t addr)
{
// The flipped MSB of the Xi 8088 is only present in the on-disk files,
// in ram the mapping is as the software sees. This does not cause
// problems with the programming commands because they only use the
// lower 2 bytes.
if (romset == ROM_XI8088 && !xi8088_bios_128kb())
return addr & 0xffff;
else
return addr & 0x1ffff;
}
static void sst_new_command(sst_t *sst, uint8_t val)
{
switch (val)
@ -69,11 +82,11 @@ static void sst_new_command(sst_t *sst, uint8_t val)
}
}
static void sst_sector_erase(sst_t *sst, uint32_t addr)
static void sst_sector_erase(sst_t *sst, uint32_t sst_addr)
{
// pclog("SST sector erase %08x\n", addr);
memset(&rom[addr & 0x1f000], 0xff, 4096);
memset(&sst->data[addr & 0x1f000], 0xff, 4096);
// pclog("SST sector erase sst_addr %08x\n", sst_addr);
memset(&rom[sst_addr & 0x1f000], 0xff, 4096);
memset(&sst->data[sst_addr & 0x1f000], 0xff, 4096);
sst->dirty = 1;
}
@ -117,7 +130,7 @@ static void sst_write(uint32_t addr, uint8_t val, void *p)
sst_new_command(sst, val);
else if (val == SST_SECTOR_ERASE && sst->erase)
{
sst_sector_erase(sst, addr);
sst_sector_erase(sst, sst_masked_rom_addr(addr));
sst->command_state = 0;
}
else
@ -125,8 +138,8 @@ static void sst_write(uint32_t addr, uint8_t val, void *p)
break;
case 3:
// pclog("Byte program %08x %02x\n", addr, val);
rom[addr & 0x1ffff] = val;
sst->data[addr & 0x1ffff] = val;
rom[sst_masked_rom_addr(addr)] = val;
sst->data[sst_masked_rom_addr(addr)] = val;
sst->command_state = 0;
sst->dirty = 1;
break;
@ -177,9 +190,14 @@ static void *sst_39sf010_init()
switch(romset)
{
case ROM_XI8088:
strcpy(sst->flash_path, "xi8088/");
break;
case ROM_FIC_VA503P:
strcpy(sst->flash_path, "fic_va503p/");
break;
default:
fatal("sst_39sf010_init on unsupported ROM set %i\n", romset);
}
@ -187,7 +205,21 @@ static void *sst_39sf010_init()
f = romfopen(sst->flash_path, "rb");
if (f)
{
fread(rom, 0x20000, 1, f);
switch(romset)
{
case ROM_XI8088:
if (xi8088_bios_128kb())
fread(rom + 0x10000, 0x10000, 1, f);
fread(rom, 0x10000, 1, f);
break;
case ROM_FIC_VA503P:
fread(rom, 0x20000, 1, f);
break;
default:
fatal("sst_39sf010_init on unsupported ROM set %i\n", romset);
}
fclose(f);
}
memcpy(sst->data, rom, 0x20000);
@ -204,7 +236,21 @@ static void sst_39sf010_close(void *p)
if (sst->dirty)
{
FILE *f = romfopen(sst->flash_path, "wb");
fwrite(sst->data, 0x20000, 1, f);
switch(romset)
{
case ROM_XI8088:
if (xi8088_bios_128kb())
fwrite(sst->data + 0x10000, 0x10000, 1, f);
fwrite(sst->data, 0x10000, 1, f);
break;
case ROM_FIC_VA503P:
fwrite(sst->data, 0x20000, 1, f);
break;
default:
fatal("sst_39sf010_init on unsupported ROM set %i\n", romset);
}
fclose(f);
}