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stm32f1: Fix handling of option byte write. Write needs to happend on erased option bytes.

This commit is contained in:
Uwe Bonnes 2013-10-06 16:47:30 +02:00
parent 15e529a43a
commit 086f3565f0
1 changed files with 35 additions and 3 deletions
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36
src/stm32f1.c
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@ -324,10 +324,12 @@ static bool stm32f1_option_erase(target *t)
return true;
}
static bool stm32f1_option_write(target *t, uint32_t addr, uint16_t value)
static bool stm32f1_option_write_erased(target *t, uint32_t addr, uint16_t value)
{
ADIv5_AP_t *ap = adiv5_target_ap(t);
if (value == 0xffff)
return true;
/* Erase option bytes instruction */
adiv5_ap_mem_write(ap, FLASH_CR, FLASH_CR_OPTPG | FLASH_CR_OPTWRE);
adiv5_ap_mem_write_halfword(ap, addr, value);
@ -338,6 +340,36 @@ static bool stm32f1_option_write(target *t, uint32_t addr, uint16_t value)
return true;
}
static bool stm32f1_option_write(target *t, uint32_t addr, uint16_t value)
{
ADIv5_AP_t *ap = adiv5_target_ap(t);
uint16_t opt_val[8];
int i, index;
index = (addr - FLASH_OBP_RDP) / 2;
if ((index < 0) || (index > 7))
return false;
/* Retrieve old values */
for (i = 0; i < 16; i = i +4) {
uint32_t val = adiv5_ap_mem_read(ap, FLASH_OBP_RDP + i);
opt_val[i/2] = val & 0xffff;
opt_val[i/2 +1] = val >> 16;
}
if (opt_val[index] == value)
return true;
/* Check for erased value */
if (opt_val[index] != 0xffff)
if (!(stm32f1_option_erase(t)))
return false;
opt_val[index] = value;
/* Write changed values*/
for (i = 0; i < 8; i++)
if (!(stm32f1_option_write_erased
(t, FLASH_OBP_RDP + i*2,opt_val[i])))
return false;
return true;
}
static bool stm32f1_cmd_option(target *t, int argc, char *argv[])
{
uint32_t addr, val;
@ -360,7 +392,7 @@ static bool stm32f1_cmd_option(target *t, int argc, char *argv[])
if ((argc == 2) && !strcmp(argv[1], "erase")) {
stm32f1_option_erase(t);
stm32f1_option_write(t, FLASH_OBP_RDP, flash_obp_rdp_key);
stm32f1_option_write_erased(t, FLASH_OBP_RDP, flash_obp_rdp_key);
} else if (rdprt) {
gdb_out("Device is Read Protected\n");
gdb_out("Use \"monitor option erase\" to unprotect, erasing device\n");