Commit 2e0e6c56 authored by Tomas Vanek's avatar Tomas Vanek Committed by Freddie Chopin
Browse files

flash/nor/at91samd: fix chip erase of a secured device

'at91samd chip-erase' command did not work on secured device.

Fix it changing address of DSU.CTRL register
(see Atmel SAM D21 datasheet, 13.9. Intellectual Property Protection).

While on it check error return of DSU.CTRL write.

Change-Id: I83155a634a5458cdc0cc16c99c0e155eb1d8b3d6
Signed-off-by: default avatarTomas Vanek <>
Reported-by: default avatarThomas Irmen <>

Tested-by: jenkins
Reviewed-by: default avatarFreddie Chopin <>
parent 44ad4fdc
......@@ -36,6 +36,7 @@
#define SAMD_DSU_STATUSA 1 /* DSU status register */
#define SAMD_DSU_DID 0x18 /* Device ID register */
#define SAMD_DSU_CTRL_EXT 0x100 /* CTRL register, external access */
#define SAMD_NVMCTRL_CTRLA 0x00 /* NVM control A register */
#define SAMD_NVMCTRL_CTRLB 0x04 /* NVM control B register */
......@@ -859,18 +860,23 @@ COMMAND_HANDLER(samd_handle_info_command)
struct target *target = get_current_target(CMD_CTX);
int res = ERROR_FAIL;
if (target) {
/* Enable access to the DSU by disabling the write protect bit */
target_write_u32(target, SAMD_PAC1, (1<<1));
/* intentionally without error checking - not accessible on secured chip */
/* Tell the DSU to perform a full chip erase. It takes about 240ms to
* perform the erase. */
target_write_u8(target, SAMD_DSU, (1<<4));
command_print(CMD_CTX, "chip erased");
res = target_write_u8(target, SAMD_DSU + SAMD_DSU_CTRL_EXT, (1<<4));
if (res == ERROR_OK)
command_print(CMD_CTX, "chip erase started");
command_print(CMD_CTX, "write to DSU CTRL failed");
return ERROR_OK;
return res;
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