diff options
Diffstat (limited to '82802ab.c')
| -rw-r--r-- | 82802ab.c | 49 |
1 files changed, 49 insertions, 0 deletions
@@ -205,3 +205,52 @@ int write_82802ab(struct flashchip *flash, uint8_t *buf) return 0; } + +int unlock_28f004s5(struct flashrom *flash) +{ + chipaddr bios = flash->virtual_memory; + uint8_t mcfg, bcfg, need_unlock = 0, can_unlock = 0; + + /* Clear status register */ + chip_writeb(0x50, bios); + + /* Read identifier codes */ + chip_writeb(0x90, bios); + + /* Read master lock-bit */ + mcfg = chip_readb(bios + 0x3); + msg_cinfo("master lock is "); + if (mcfg) { + msg_cdbg("locked!\n"); + } else { + msg_cdbg("unlocked!\n"); + can_unlock = 1; + } + + /* Read block lock-bits */ + for (i = 0; i < flash->total_size * 1024; i+= (64 * 1024)) { + bcfg = chip_readb(bios + i + 2); // read block lock config + msg_cdbg("block lock at %06x is %slocked!\n", i, bcfg ? "" : "un"); + if (bcfg) { + need_unlock = 1; + } + } + + /* Reset chip */ + chip_writeb(0xFF, bios); + + /* Unlock: clear block lock-bits, if needed */ + if (can_unlock && need_unlock) { + chip_writeb(0x60, bios); + chip_writeb(0xD0, bios); + chip_writeb(0xFF, bios); + } + + /* Error: master locked or a block is locked */ + if (!can_unlock && need_unlock) { + msg_cerr("At least one block is locked and lockdown is active!\n"); + return -1; + } + + return 0; +} |
