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[efm32] Add command to set and print bootloader enable status 

This is a bit in the Lock Bit (LB) flash page, so it can only be
cleared by this routine
This commit is contained in:
Richard Meadows 2019-01-18 18:28:17 +00:00 committed by Uwe Bonnes
parent 7f0d5febc3
commit 260fc88d8f
1 changed files with 70 additions and 0 deletions
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70
src/target/efm32.c
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@ -56,11 +56,13 @@ static const uint16_t efm32_flash_write_stub[] = {
static bool efm32_cmd_erase_all(target *t, int argc, const char **argv);
static bool efm32_cmd_serial(target *t, int argc, const char **argv);
static bool efm32_cmd_efm_info(target *t, int argc, const char **argv);
static bool efm32_cmd_bootloader(target *t, int argc, const char **argv);
const struct command_s efm32_cmd_list[] = {
{"erase_mass", (cmd_handler)efm32_cmd_erase_all, "Erase entire flash memory"},
{"serial", (cmd_handler)efm32_cmd_serial, "Prints unique number"},
{"efm_info", (cmd_handler)efm32_cmd_efm_info, "Prints information about the device"},
{"bootloader", (cmd_handler)efm32_cmd_bootloader, "Bootloader status in CLW0"},
{NULL, NULL, NULL}
};
@ -107,6 +109,18 @@ const struct command_s efm32_cmd_list[] = {
#define EFM32_V2_DI (EFM32_INFO+0x81B0)
/* -------------------------------------------------------------------------- */
/* Lock Bits (LB) */
/* -------------------------------------------------------------------------- */
#define EFM32_LOCK_BITS_DLW (EFM32_LOCK_BITS+(4*127))
#define EFM32_LOCK_BITS_ULW (EFM32_LOCK_BITS+(4*126))
#define EFM32_LOCK_BITS_MLW (EFM32_LOCK_BITS+(4*125))
#define EFM32_LOCK_BITS_CLW0 (EFM32_LOCK_BITS+(4*122))
#define EFM32_CLW0_BOOTLOADER_ENABLE (1<<1)
#define EFM32_CLW0_PINRESETSOFT (1<<2)
/* -------------------------------------------------------------------------- */
/* Device Information (DI) Area - Version 1 V1 */
/* -------------------------------------------------------------------------- */
@ -844,3 +858,59 @@ static bool efm32_cmd_efm_info(target *t, int argc, const char **argv)
return true;
}
/**
* Bootloader status in CLW0, if applicable.
*
* This is a bit in flash, so it is possible to clear it only once.
*/
static bool efm32_cmd_bootloader(target *t, int argc, const char **argv)
{
/* lookup device and part number */
efm32_device_t const* device = efm32_get_device(t->driver[2] - 32);
if (device == NULL) {
return true;
}
uint32_t msc = device->msc_addr;
if (device->bootloader_size == 0) {
tc_printf(t, "This device has no bootloader.\n");
return false;
}
uint32_t clw0 = target_mem_read32(t, EFM32_LOCK_BITS_CLW0);
bool bootloader_status = (clw0 & EFM32_CLW0_BOOTLOADER_ENABLE)?1:0;
if (argc == 1) {
tc_printf(t, "Bootloader %s\n",
bootloader_status ? "enabled" : "disabled");
return true;
} else {
bootloader_status = (argv[1][0] == 'e');
}
/* Modify bootloader enable bit */
clw0 &= bootloader_status?~0:~EFM32_CLW0_BOOTLOADER_ENABLE;
/* Unlock */
target_mem_write32(t, EFM32_MSC_LOCK(msc), EFM32_MSC_LOCK_LOCKKEY);
/* Set WREN bit to enabel MSC write and erase functionality */
target_mem_write32(t, EFM32_MSC_WRITECTRL(msc), 1);
/* Write address of CLW0 */
target_mem_write32(t, EFM32_MSC_ADDRB(msc), EFM32_LOCK_BITS_CLW0);
target_mem_write32(t, EFM32_MSC_WRITECMD(msc), EFM32_MSC_WRITECMD_LADDRIM);
/* Issue the write */
target_mem_write32(t, EFM32_MSC_WDATA(msc), clw0);
target_mem_write32(t, EFM32_MSC_WRITECMD(msc), EFM32_MSC_WRITECMD_WRITEONCE);
/* Poll MSC Busy */
while ((target_mem_read32(t, EFM32_MSC_STATUS(msc)) & EFM32_MSC_STATUS_BUSY)) {
if (target_check_error(t))
return false;
}
return true;
}