-/* The logical erase value of an xmc4xxx memory cell is 0x00,
- * therefore, we cannot use the built in flash blank check and must
- * implement our own */
-
-/** Checks whether a memory region is zeroed. */
-int xmc4xxx_blank_check_memory(struct target *target,
- uint32_t address, uint32_t count, uint32_t *blank)
-{
- struct working_area *erase_check_algorithm;
- struct reg_param reg_params[3];
- struct armv7m_algorithm armv7m_info;
- int retval;
-
- /* see contrib/loaders/erase_check/armv7m_0_erase_check.s for src */
-
- static const uint8_t erase_check_code[] = {
- /* loop: */
- 0x03, 0x78, /* ldrb r3, [r0] */
- 0x01, 0x30, /* adds r0, #1 */
- 0x1A, 0x43, /* orrs r2, r2, r3 */
- 0x01, 0x39, /* subs r1, r1, #1 */
- 0xFA, 0xD1, /* bne loop */
- 0x00, 0xBE /* bkpt #0 */
- };
-
- /* make sure we have a working area */
- if (target_alloc_working_area(target, sizeof(erase_check_code),
- &erase_check_algorithm) != ERROR_OK)
- return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
-
- retval = target_write_buffer(target, erase_check_algorithm->address,
- sizeof(erase_check_code), (uint8_t *)erase_check_code);
- if (retval != ERROR_OK)
- return retval;
-
- armv7m_info.common_magic = ARMV7M_COMMON_MAGIC;
- armv7m_info.core_mode = ARM_MODE_THREAD;
-
- init_reg_param(®_params[0], "r0", 32, PARAM_OUT);
- buf_set_u32(reg_params[0].value, 0, 32, address);
-
- init_reg_param(®_params[1], "r1", 32, PARAM_OUT);
- buf_set_u32(reg_params[1].value, 0, 32, count);
-
- init_reg_param(®_params[2], "r2", 32, PARAM_IN_OUT);
- buf_set_u32(reg_params[2].value, 0, 32, 0x00);
-
- retval = target_run_algorithm(target,
- 0,
- NULL,
- 3,
- reg_params,
- erase_check_algorithm->address,
- erase_check_algorithm->address + (sizeof(erase_check_code) - 2),
- 10000,
- &armv7m_info);
-
- if (retval == ERROR_OK)
- *blank = buf_get_u32(reg_params[2].value, 0, 32);
-
- destroy_reg_param(®_params[0]);
- destroy_reg_param(®_params[1]);
- destroy_reg_param(®_params[2]);
-
- target_free_working_area(target, erase_check_algorithm);
-
- return retval;
-}
-
-static int xmc4xxx_flash_blank_check(struct flash_bank *bank)
-{
- struct target *target = bank->target;
- int i;
- int retval;
- uint32_t blank;
-
- if (bank->target->state != TARGET_HALTED) {
- LOG_ERROR("Target not halted");
- return ERROR_TARGET_NOT_HALTED;
- }
-
- for (i = 0; i < bank->num_sectors; i++) {
- uint32_t address = bank->base + bank->sectors[i].offset;
- uint32_t size = bank->sectors[i].size;
-
- LOG_DEBUG("Erase checking 0x%08"PRIx32, address);
- retval = xmc4xxx_blank_check_memory(target, address, size, &blank);
-
- if (retval != ERROR_OK)
- break;
-
- if (blank == 0x00)
- bank->sectors[i].is_erased = 1;
- else
- bank->sectors[i].is_erased = 0;
- }
-
- return ERROR_OK;
-}
-