diff options
Diffstat (limited to 'util/flashrom/jedec.c')
| -rw-r--r-- | util/flashrom/jedec.c | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/util/flashrom/jedec.c b/util/flashrom/jedec.c index c4afadf1e5..0c34e17a58 100644 --- a/util/flashrom/jedec.c +++ b/util/flashrom/jedec.c @@ -33,6 +33,58 @@ #define MAX_REFLASH_TRIES 0x10 +void toggle_ready_jedec(volatile uint8_t *dst) +{ + unsigned int i = 0; + uint8_t tmp1, tmp2; + + tmp1 = *dst & 0x40; + + while (i++ < 0xFFFFFFF) { + tmp2 = *dst & 0x40; + if (tmp1 == tmp2) { + break; + } + tmp1 = tmp2; + } +} + +void data_polling_jedec(volatile uint8_t *dst, uint8_t data) +{ + unsigned int i = 0; + uint8_t tmp; + + data &= 0x80; + + while (i++ < 0xFFFFFFF) { + tmp = *dst & 0x80; + if (tmp == data) { + break; + } + } +} + +void unprotect_jedec(volatile uint8_t *bios) +{ + *(volatile uint8_t *)(bios + 0x5555) = 0xAA; + *(volatile uint8_t *)(bios + 0x2AAA) = 0x55; + *(volatile uint8_t *)(bios + 0x5555) = 0x80; + *(volatile uint8_t *)(bios + 0x5555) = 0xAA; + *(volatile uint8_t *)(bios + 0x2AAA) = 0x55; + *(volatile uint8_t *)(bios + 0x5555) = 0x20; + + usleep(200); +} + +void protect_jedec(volatile uint8_t *bios) +{ + *(volatile uint8_t *)(bios + 0x5555) = 0xAA; + *(volatile uint8_t *)(bios + 0x2AAA) = 0x55; + *(volatile uint8_t *)(bios + 0x5555) = 0xA0; + + usleep(200); +} + int probe_jedec(struct flashchip *flash) { volatile uint8_t *bios = flash->virtual_memory; |