FPB-RA8E1 Data Flash return FSP_ERR_CMD_LOCKED

Question

Hi, All~ 
 I am using the ra-fsp flash_hp example, but the R_FLASH_HP_Erase API does not work as FSP_ERR_CMD_LOCKED is returned during the operation. 
 I also tested it on EK-RA8M1, but the same error is returned and it does not work. 
 Please advise which part I should fix. 
 
 I created the project using FSP 5.8.0.

AZ [Renesas] · Accepted Answer

You are possibly trying to access data flash with wrong security attribution, that is why DFAE bit is set to 1.

From this image I see that no secure area is allocated for data flash: 
 
 So accessing the data area with secure alias will fail:

Make sure you Initialize the device back to factory default settings with Renesas Device Partition Manager or Renesas Flash Programmer tool and keep this setting to 'No' to keep the default Trustzone settings:

PC_Renesas · Answer

Hi RooneyJang , 
 the RA8 MCU series has a security feature, which locks the flash memory. The Unit that manages the flash access is the FCU (Flash Control Unit) -> for more explaination see Chapter 49 of the Groups user manual RA8E1 Group User's Manual: Hardware (renesas.com) . By observing the DFAE bit of the FASTAT register, you can see, if a data flash access violation occurred. other than that, please check out the chapter 49.11.1.3 Protection by Block Protect Setting. 
 Please also see this Application Note: RA8 MCU Quick Design Guide (renesas.com) - 8.1.4.2 Flash Block Protection. It is very helpful to understand, how the flash protection works. I hope this answer helps 
 
 best regards 
 
 PC_Renesas

PC_Renesas · Answer

HI RooneyJang , I have taken the above example and reduced it to the bare essentials. You can find my example code here: 
 #define FLASH_DF_BLOCK_0 0x27000040U

#define TRANSFER_LENGTH 4

uint8_t g_dest[TRANSFER_LENGTH];

uint8_t g_src[TRANSFER_LENGTH];

flash_result_t blank_check_result;

void r_flash_hp_basic_example (void)

{

/* Initialize p_src to known data */

for (uint8_t i = 0; i < TRANSFER_LENGTH; i++)

{

g_src[i] = (uint8_t) ('A' + (i % 26));

}

/* Open the flash hp instance. */

fsp_err_t err = R_FLASH_HP_Open(&g_flash0_ctrl, &g_flash0_cfg);

assert(FSP_SUCCESS == err);

/* Erase 1 block of data flash starting at block 0. */

err = R_FLASH_HP_Erase(&g_flash0_ctrl, FLASH_DF_BLOCK_0, 1);

assert(FSP_SUCCESS == err);

/* Check if block 0 is erased. */

err = R_FLASH_HP_BlankCheck(&g_flash0_ctrl, FLASH_DF_BLOCK_0, TRANSFER_LENGTH, &blank_check_result);

assert(FSP_SUCCESS == err);

/* Verify the previously erased area is blank */

assert(FLASH_RESULT_BLANK == blank_check_result);

/* Write 32 bytes to the first block of data flash. */

err = R_FLASH_HP_Write(&g_flash0_ctrl, g_src, FLASH_DF_BLOCK_0, TRANSFER_LENGTH);

assert(FSP_SUCCESS == err);

assert(0 == memcmp(g_src, (uint8_t *) FLASH_DF_BLOCK_0, TRANSFER_LENGTH));

} 
 All of this uses the r_flash_hp stack. The code writes teh ASCII symbols "ABCD" to the memory address 0x27000040.

I hope the answer helps. Best regards PC_Renesas

FPB-RA8E1 Data Flash return FSP_ERR_CMD_LOCKED

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