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kinetis: Clobber security byte with unsecure value. 

May be overridden with `mon unsafe enable`.
This commit is contained in:
Gareth McMullin 2017-03-27 14:01:35 +13:00
parent 7de304d72a
commit 0ed793fe24
1 changed files with 39 additions and 6 deletions
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45
src/target/kinetis.c
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@ -61,6 +61,24 @@
#define KL_GEN_PAGESIZE 0x400
static bool kinetis_cmd_unsafe(target *t, int argc, char *argv[]);
static bool unsafe_enabled;
const struct command_s kinetis_cmd_list[] = {
{"unsafe", (cmd_handler)kinetis_cmd_unsafe, "Allow programming security byte (enable|disable)"},
{NULL, NULL, NULL}
};
static bool kinetis_cmd_unsafe(target *t, int argc, char *argv[])
{
if (argc == 1)
tc_printf(t, "Allow programming security byte: %s\n",
unsafe_enabled ? "enabled" : "disabled");
else
unsafe_enabled = argv[1][0] == 'e';
return true;
}
static int kl_gen_flash_erase(struct target_flash *f, target_addr addr, size_t len);
static int kl_gen_flash_write(struct target_flash *f,
target_addr dest, const void *src, size_t len);
@ -88,13 +106,13 @@ bool kinetis_probe(target *t)
target_add_ram(t, 0x1ffff000, 0x1000);
target_add_ram(t, 0x20000000, 0x3000);
kl_gen_add_flash(t, 0x00000000, 0x20000, 0x400);
return true;
break;
case 0x231:
t->driver = "KL27";
target_add_ram(t, 0x1fffe000, 0x2000);
target_add_ram(t, 0x20000000, 0x6000);
kl_gen_add_flash(t, 0x00000000, 0x40000, 0x400);
return true;
break;
case 0x021: /* KL02 family */
switch((sdid>>16) & 0x0f){
case 3:
@ -118,22 +136,26 @@ bool kinetis_probe(target *t)
default:
return false;
}
return true;
break;
case 0x031: /* KL03 family */
t->driver = "KL03";
target_add_ram(t, 0x1ffffe00, 0x200);
target_add_ram(t, 0x20000000, 0x600);
kl_gen_add_flash(t, 0, 0x8000, 0x400);
return true;
break;
case 0x220: /* K22F family */
t->driver = "K22F";
target_add_ram(t, 0x1c000000, 0x4000000);
target_add_ram(t, 0x20000000, 0x100000);
kl_gen_add_flash(t, 0, 0x40000, 0x800);
kl_gen_add_flash(t, 0x40000, 0x40000, 0x800);
return true;
break;
default:
return false;
}
return false;
unsafe_enabled = false;
target_add_commands(t, kinetis_cmd_list, t->driver);
return true;
}
static bool
@ -185,9 +207,20 @@ static int kl_gen_flash_erase(struct target_flash *f, target_addr addr, size_t l
return 0;
}
#define FLASH_SECURITY_BYTE_ADDRESS 0x40C
#define FLASH_SECURITY_BYTE_UNSECURED 0xFE
static int kl_gen_flash_write(struct target_flash *f,
target_addr dest, const void *src, size_t len)
{
/* Ensure we don't write something horrible over the security byte */
if (!unsafe_enabled &&
(dest <= FLASH_SECURITY_BYTE_ADDRESS) &&
((dest + len) > FLASH_SECURITY_BYTE_ADDRESS)) {
((uint8_t*)src)[FLASH_SECURITY_BYTE_ADDRESS - dest] =
FLASH_SECURITY_BYTE_UNSECURED;
}
while (len) {
if (kl_gen_command(f->t, FTFA_CMD_PROGRAM_LONGWORD, dest, src)) {
len -= 4;