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Added ability to lock and unlock boot rom for samd controllers

This commit is contained in:
Carl 2019-02-13 16:33:07 -08:00
parent 7032abd2b0
commit 02c1934c03
1 changed files with 46 additions and 0 deletions
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46
src/target/samd.c
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@ -44,6 +44,8 @@ static int samd_flash_write(struct target_flash *f,
static bool samd_cmd_erase_all(target *t);
static bool samd_cmd_lock_flash(target *t);
static bool samd_cmd_unlock_flash(target *t);
static bool samd_cmd_unlock_bootprot(target *t);
static bool samd_cmd_lock_bootprot(target *t);
static bool samd_cmd_read_userrow(target *t);
static bool samd_cmd_serial(target *t);
static bool samd_cmd_mbist(target *t);
@ -53,6 +55,8 @@ const struct command_s samd_cmd_list[] = {
{"erase_mass", (cmd_handler)samd_cmd_erase_all, "Erase entire flash memory"},
{"lock_flash", (cmd_handler)samd_cmd_lock_flash, "Locks flash against spurious commands"},
{"unlock_flash", (cmd_handler)samd_cmd_unlock_flash, "Unlocks flash"},
{"lock_bootprot", (cmd_handler)samd_cmd_lock_bootprot, "Lock the boot protections to maximum"},
{"unlock_bootprot", (cmd_handler)samd_cmd_unlock_bootprot, "Unlock the boot protections to minimum"},
{"user_row", (cmd_handler)samd_cmd_read_userrow, "Prints user row from flash"},
{"serial", (cmd_handler)samd_cmd_serial, "Prints serial number"},
{"mbist", (cmd_handler)samd_cmd_mbist, "Runs the built-in memory test"},
@ -599,6 +603,48 @@ static bool samd_cmd_unlock_flash(target *t)
return samd_set_flashlock(t, 0xFFFF);
}
static bool samd_set_bootprot(target *t, uint16_t value)
{
uint32_t high = target_mem_read32(t, SAMD_NVM_USER_ROW_HIGH);
uint32_t low = target_mem_read32(t, SAMD_NVM_USER_ROW_LOW);
/* Write address of a word in the row to erase it */
/* Must be shifted right for 16-bit address, see Datasheet §20.8.8 Address */
target_mem_write32(t, SAMD_NVMC_ADDRESS, SAMD_NVM_USER_ROW_LOW >> 1);
/* Issue the erase command */
target_mem_write32(t, SAMD_NVMC_CTRLA,
SAMD_CTRLA_CMD_KEY | SAMD_CTRLA_CMD_ERASEAUXROW);
/* Poll for NVM Ready */
while ((target_mem_read32(t, SAMD_NVMC_INTFLAG) & SAMD_NVMC_READY) == 0)
if (target_check_error(t))
return -1;
/* Modify the low word of the user row */
low = (low & 0xFFFFFFF8) | ((value << 0 ) & 0x00000007);
/* Write back */
target_mem_write32(t, SAMD_NVM_USER_ROW_LOW, low);
target_mem_write32(t, SAMD_NVM_USER_ROW_HIGH, high);
/* Issue the page write command */
target_mem_write32(t, SAMD_NVMC_CTRLA,
SAMD_CTRLA_CMD_KEY | SAMD_CTRLA_CMD_WRITEAUXPAGE);
return true;
}
static bool samd_cmd_lock_bootprot(target *t)
{
return samd_set_bootprot(t, 0);
}
static bool samd_cmd_unlock_bootprot(target *t)
{
return samd_set_bootprot(t, 7);
}
static bool samd_cmd_read_userrow(target *t)
{
tc_printf(t, "User Row: 0x%08x%08x\n",