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flash Kinetis: dynamic status detection before starting mass_erase 

The change prevents starting mass_erase in unstable state of MCU
(RESET/WDOG loop).
mass_erase of secured MCU using manual reset button is supported.
Timeouts are measured by timeval_ms() instead of iteration count.
mass_erase timeout prolonged to 16 seconds because aborting
mass_erase in progress (deasserting reset) leaves the device
in security locked state.

Change-Id: I6605532df56080a54c2a1dfe49094e3db4ce534a
Signed-off-by: Tomas Vanek <vanekt@fbl.cz>
Reviewed-on: http://openocd.zylin.com/3551
Tested-by: jenkins
Reviewed-by: Steven Stallion <stallion@squareup.com>
Reviewed-by: Andreas Fritiofson <andreas.fritiofson@gmail.com>
This commit is contained in:
Tomas Vanek 2016-07-19 14:27:04 +02:00 committed by Andreas Fritiofson
parent 6d5b4d709c
commit 77478eb0f5
1 changed files with 66 additions and 40 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

106
src/flash/nor/kinetis.c
View File

@ -35,6 +35,7 @@
#include "jtag/interface.h"
#include "imp.h"
#include <helper/binarybuffer.h>
#include <helper/time_support.h>
#include <target/target_type.h>
#include <target/algorithm.h>
#include <target/armv7m.h>
@ -256,7 +257,7 @@ struct kinetis_flash_bank {
#define MDM_CTRL_VLLSX_DBG_ACK (1<<6)
#define MDM_CTRL_VLLSX_STAT_ACK (1<<7)
#define MDM_ACCESS_TIMEOUT 3000 /* iterations */
#define MDM_ACCESS_TIMEOUT 500 /* msec */
static int kinetis_mdm_write_register(struct adiv5_dap *dap, unsigned reg, uint32_t value)
{
@ -299,11 +300,12 @@ static int kinetis_mdm_read_register(struct adiv5_dap *dap, unsigned reg, uint32
return ERROR_OK;
}
static int kinetis_mdm_poll_register(struct adiv5_dap *dap, unsigned reg, uint32_t mask, uint32_t value)
static int kinetis_mdm_poll_register(struct adiv5_dap *dap, unsigned reg,
uint32_t mask, uint32_t value, uint32_t timeout_ms)
{
uint32_t val;
int retval;
int timeout = MDM_ACCESS_TIMEOUT;
int64_t ms_timeout = timeval_ms() + timeout_ms;
do {
retval = kinetis_mdm_read_register(dap, reg, &val);
@ -311,7 +313,7 @@ static int kinetis_mdm_poll_register(struct adiv5_dap *dap, unsigned reg, uint32
return retval;
alive_sleep(1);
} while (timeout--);
} while (timeval_ms() < ms_timeout);
LOG_DEBUG("MDM: polling timed out");
return ERROR_FAIL;
@ -331,6 +333,7 @@ COMMAND_HANDLER(kinetis_mdm_halt)
int retval;
int tries = 0;
uint32_t stat;
int64_t ms_timeout = timeval_ms() + MDM_ACCESS_TIMEOUT;
if (!dap) {
LOG_ERROR("Cannot perform halt with a high-level adapter");
@ -357,7 +360,7 @@ COMMAND_HANDLER(kinetis_mdm_halt)
== (MDM_STAT_FREADY | MDM_STAT_SYSRES))
break;
if (tries > MDM_ACCESS_TIMEOUT) {
if (timeval_ms() >= ms_timeout) {
LOG_ERROR("MDM: halt timed out");
return ERROR_FAIL;
}
@ -403,7 +406,7 @@ COMMAND_HANDLER(kinetis_mdm_reset)
return retval;
}
retval = kinetis_mdm_poll_register(dap, MDM_REG_STAT, MDM_STAT_SYSRES, 0);
retval = kinetis_mdm_poll_register(dap, MDM_REG_STAT, MDM_STAT_SYSRES, 0, 500);
if (retval != ERROR_OK) {
LOG_ERROR("MDM: failed to assert reset");
return retval;
@ -459,42 +462,61 @@ COMMAND_HANDLER(kinetis_mdm_mass_erase)
}
/*
* ... Read the MDM-AP status register Mass Erase Enable bit to
* determine if the mass erase command is enabled. If Mass Erase
* Enable = 0, then mass erase is disabled and the processor
* cannot be erased or unsecured. If Mass Erase Enable = 1, then
* the mass erase command can be used...
* ... Read the MDM-AP status register repeatedly and wait for
* stable conditions suitable for mass erase:
* - mass erase is enabled
* - flash is ready
* - reset is finished
*
* Mass erase is started as soon as all conditions are met in 32
* subsequent status reads.
*
* In case of not stable conditions (RESET/WDOG loop in secured device)
* the user is asked for manual pressing of RESET button
* as a last resort.
*/
uint32_t stat;
int cnt_mass_erase_disabled = 0;
int cnt_ready = 0;
int64_t ms_start = timeval_ms();
bool man_reset_requested = false;
retval = kinetis_mdm_read_register(dap, MDM_REG_STAT, &stat);
if (retval != ERROR_OK) {
LOG_ERROR("MDM: failed to read MDM_REG_STAT");
goto deassert_reset_and_exit;
}
do {
uint32_t stat = 0;
int64_t ms_elapsed = timeval_ms() - ms_start;
if (!(stat & MDM_STAT_FMEEN)) {
LOG_ERROR("MDM: mass erase is disabled");
goto deassert_reset_and_exit;
}
if (!man_reset_requested && ms_elapsed > 100) {
LOG_INFO("MDM: Press RESET button now if possible.");
man_reset_requested = true;
}
if ((stat & MDM_STAT_SYSSEC) && !(jtag_get_reset_config() & RESET_HAS_SRST)) {
LOG_ERROR("Mass erase of a secured MCU is not possible without hardware reset.");
LOG_INFO("Connect SRST and use 'reset_config srst_only'.");
goto deassert_reset_and_exit;
}
if (ms_elapsed > 3000) {
LOG_ERROR("MDM: waiting for mass erase conditions timed out.");
LOG_INFO("Mass erase of a secured MCU is not possible without hardware reset.");
LOG_INFO("Connect SRST, use 'reset_config srst_only' and retry.");
goto deassert_reset_and_exit;
}
retval = kinetis_mdm_read_register(dap, MDM_REG_STAT, &stat);
if (retval != ERROR_OK) {
cnt_ready = 0;
continue;
}
/*
* ... Read the MDM-AP status register until the Flash Ready bit sets
* and System Reset is asserted...
*/
retval = kinetis_mdm_poll_register(dap, MDM_REG_STAT,
MDM_STAT_FREADY | MDM_STAT_SYSRES,
MDM_STAT_FREADY);
if (retval != ERROR_OK) {
LOG_ERROR("MDM: flash ready / system reset timeout");
goto deassert_reset_and_exit;
}
if (!(stat & MDM_STAT_FMEEN)) {
cnt_ready = 0;
cnt_mass_erase_disabled++;
if (cnt_mass_erase_disabled > 10) {
LOG_ERROR("MDM: mass erase is disabled");
goto deassert_reset_and_exit;
}
continue;
}
if ((stat & (MDM_STAT_FREADY | MDM_STAT_SYSRES)) == MDM_STAT_FREADY)
cnt_ready++;
else
cnt_ready = 0;
} while (cnt_ready < 32);
/*
* ... Write the MDM-AP control register to set the Flash Mass
@ -510,8 +532,10 @@ COMMAND_HANDLER(kinetis_mdm_mass_erase)
/*
* ... Read the MDM-AP control register until the Flash Mass
* Erase in Progress bit clears...
* Data sheed defines erase time <3.6 sec/512kB flash block.
* The biggest device has 4 pflash blocks => timeout 16 sec.
*/
retval = kinetis_mdm_poll_register(dap, MDM_REG_CTRL, MDM_CTRL_FMEIP, 0);
retval = kinetis_mdm_poll_register(dap, MDM_REG_CTRL, MDM_CTRL_FMEIP, 0, 16000);
if (retval != ERROR_OK) {
LOG_ERROR("MDM: mass erase timeout");
goto deassert_reset_and_exit;
@ -1018,6 +1042,7 @@ static int kinetis_ftfx_command(struct target *target, uint8_t fcmd, uint32_t fa
fccobb, fccoba, fccob9, fccob8};
int result, i;
uint8_t buffer;
int64_t ms_timeout = timeval_ms() + 250;
/* wait for done */
for (i = 0; i < 50; i++) {
@ -1054,7 +1079,7 @@ static int kinetis_ftfx_command(struct target *target, uint8_t fcmd, uint32_t fa
return result;
/* wait for done */
for (i = 0; i < 240; i++) { /* Need longtime for "Mass Erase" Command Nemui Changed */
do {
result =
target_read_memory(target, FTFx_FSTAT, 1, 1, ftfx_fstat);
@ -1063,7 +1088,8 @@ static int kinetis_ftfx_command(struct target *target, uint8_t fcmd, uint32_t fa
if (*ftfx_fstat & 0x80)
break;
}
} while (timeval_ms() < ms_timeout);
if ((*ftfx_fstat & 0xf0) != 0x80) {
LOG_ERROR