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SST flash now keeps local copy of flash data to write back on device close. Prevents flash corruption when switching models and PCem loads the new BIOS before writing out the old flash.

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This commit is contained in:
SarahW 2019-04-01 21:38:21 +01:00
commit 8a91051e25
1 changed files with 8 additions and 1 deletions
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9
src/sst39sf010.c
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@ -12,6 +12,7 @@ typedef struct sst_t
int dirty;
char flash_path[1024];
uint8_t data[0x20000];
} sst_t;
#define SST_CHIP_ERASE 0x10
@ -30,7 +31,10 @@ static void sst_new_command(sst_t *sst, uint8_t val)
{
case SST_CHIP_ERASE:
if (sst->erase)
{
memset(rom, 0xff, 0x20000);
memset(sst->data, 0xff, 0x20000);
}
sst->command_state = 0;
sst->erase = 0;
break;
@ -69,6 +73,7 @@ static void sst_sector_erase(sst_t *sst, uint32_t addr)
{
// pclog("SST sector erase %08x\n", addr);
memset(&rom[addr & 0x1f000], 0xff, 4096);
memset(&sst->data[addr & 0x1f000], 0xff, 4096);
sst->dirty = 1;
}
@ -121,6 +126,7 @@ static void sst_write(uint32_t addr, uint8_t val, void *p)
case 3:
// pclog("Byte program %08x %02x\n", addr, val);
rom[addr & 0x1ffff] = val;
sst->data[addr & 0x1ffff] = val;
sst->command_state = 0;
sst->dirty = 1;
break;
@ -184,6 +190,7 @@ static void *sst_39sf010_init()
fread(rom, 0x20000, 1, f);
fclose(f);
}
memcpy(sst->data, rom, 0x20000);
clear_id_mode(sst);
@ -197,7 +204,7 @@ static void sst_39sf010_close(void *p)
if (sst->dirty)
{
FILE *f = romfopen(sst->flash_path, "wb");
fwrite(rom, 0x20000, 1, f);
fwrite(sst->data, 0x20000, 1, f);
fclose(f);
}