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PIC32MX: add unlock cmd

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'unlock' performs a full unlock/erase of the device, removing any
code protection.

Signed-off-by: Spencer Oliver <ntfreak@users.sourceforge.net>
This commit is contained in:
Spencer Oliver
2010-03-18 09:35:45 +00:00
parent b48a94f05d
commit ae1c64706a
3 changed files with 83 additions and 2 deletions
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75
src/flash/nor/pic32mx.c
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@@ -31,6 +31,7 @@
#include "pic32mx.h"
#include <target/algorithm.h>
#include <target/mips32.h>
#include <target/mips_m4k.h>
static const struct pic32mx_devs_s {
uint8_t devid;
@@ -664,6 +665,73 @@ COMMAND_HANDLER(pic32mx_handle_pgm_word_command)
return ERROR_OK;
}
COMMAND_HANDLER(pic32mx_handle_unlock_command)
{
uint32_t mchip_cmd;
struct target *target = NULL;
struct mips_m4k_common *mips_m4k;
struct mips_ejtag *ejtag_info;
int timeout = 10;
if (CMD_ARGC < 1)
{
command_print(CMD_CTX, "pic32mx unlock <bank>");
return ERROR_OK;
}
struct flash_bank *bank;
int retval = CALL_COMMAND_HANDLER(flash_command_get_bank, 0, &bank);
if (ERROR_OK != retval)
return retval;
target = bank->target;
mips_m4k = target_to_m4k(target);
ejtag_info = &mips_m4k->mips32.ejtag_info;
/* we have to use the MTAP to perform a full erase */
mips_ejtag_set_instr(ejtag_info, MTAP_SW_MTAP);
mips_ejtag_set_instr(ejtag_info, MTAP_COMMAND);
/* first check status of device */
mchip_cmd = MCHP_STATUS;
mips_ejtag_drscan_8(ejtag_info, &mchip_cmd);
if (mchip_cmd & (1 << 7))
{
/* device is not locked */
command_print(CMD_CTX, "pic32mx is already unlocked, erasing anyway");
}
/* unlock/erase device */
mchip_cmd = MCHP_ASERT_RST;
mips_ejtag_drscan_8(ejtag_info, &mchip_cmd);
mchip_cmd = MCHP_ERASE;
mips_ejtag_drscan_8(ejtag_info, &mchip_cmd);
do {
mchip_cmd = MCHP_STATUS;
mips_ejtag_drscan_8(ejtag_info, &mchip_cmd);
if (timeout-- == 0)
{
LOG_DEBUG("timeout waiting for unlock: 0x%" PRIx32 "", mchip_cmd);
break;
}
alive_sleep(1);
} while ((mchip_cmd & (1 << 2)) || (!(mchip_cmd & (1 << 3))));
mchip_cmd = MCHP_DE_ASSERT_RST;
mips_ejtag_drscan_8(ejtag_info, &mchip_cmd);
/* select ejtag tap */
mips_ejtag_set_instr(ejtag_info, MTAP_SW_ETAP);
command_print(CMD_CTX, "pic32mx unlocked.\n"
"INFO: a reset or power cycle is required "
"for the new settings to take effect.");
return ERROR_OK;
}
static const struct command_registration pic32mx_exec_command_handlers[] = {
{
.name = "pgm_word",
@@ -671,6 +739,13 @@ static const struct command_registration pic32mx_exec_command_handlers[] = {
.mode = COMMAND_EXEC,
.help = "program a word",
},
{
.name = "unlock",
.handler = pic32mx_handle_unlock_command,
.mode = COMMAND_EXEC,
.usage = "[bank_id]",
.help = "Unlock/Erase entire device.",
},
COMMAND_REGISTRATION_DONE
};