RM57L843: Probe erasing flash via uniflash or CCS, but the unused contents are not all 0xff?

--retain="*(.intvecs)"

/* USER CODE BEGIN (1) */
ECC {
	algoL2R5F021 : address_mask = 0xfffffff8 /* Address Bits 31:3 */
	hamming_mask = R4 /* Use R4/R5 build in Mask */
	parity_mask = 0x0c /* Set which ECC bits are Even and Odd parity */
	mirroring = F021 /* RM57Lx and TMS570LCx are build in F021 */
}
/* USER CODE END */

/*----------------------------------------------------------------------------*/
/* Memory Map                                                                 */

MEMORY
{
/* USER CODE BEGIN (2) */
/* USER CODE END */
    VECTORS (X)  : origin=0x00000000 length=0x00000020
    FLASH0  (RX) : origin=0x00000020 length=0x001FFFD0	vfill=0xffffffff
    SW_VERSION	(RX) 	: origin=0x001FFFF0 length=0x00000008	/* Software Version */
    GOLDEN_CRC	(RX)	: origin=0x001FFFF8 length=0x00000008	/* golden FLASH CRC */
    FLASH1  (RX) : origin=0x00200000 length=0x00200000	vfill=0xffffffff
    STACKS  (RW) : origin=0x08000000 length=0x00001500
    RAM     (RW) : origin=0x08001500 length=0x0007EB00
    FEE     (RW) : origin=0xF0200000 length=0x00020000	vfill=0xffffffff
	/* Bank 0 ECC */
	ECC_VEC (R)     : origin=(0xF0400000 + (start(VECTORS) >> 3))
					  length=(size(VECTORS) >> 3)
					  ECC={algorithm=algoL2R5F021,input_range=VECTORS}

	ECC_FLA0 (R)    : origin=(0xF0400000 + (start(FLASH0) >> 3))
					  length=(size(FLASH0) >> 3)
					  ECC={algorithm=algoL2R5F021,input_range=FLASH0}
	/* Bank 1 ECC */
	ECC_FLA1 (R)    : origin=(0xF0400000 + (start(FLASH1) >> 3))
					  length=(size(FLASH1) >> 3)
					  ECC={algorithm=algoL2R5F021,input_range=FLASH1}
	/* Bank 7 ECC */
	ECC_FLA7 (R)    : origin=0xF0100000
					  length=(size(FEE) >> 3)
					  ECC={algorithm=algoL2R5F021,input_range=FEE}

/* USER CODE BEGIN (3) */
/* USER CODE END */
}

/* USER CODE BEGIN (4) */
/* USER CODE END */


/*----------------------------------------------------------------------------*/
/* Section Configuration                                                      */

SECTIONS
{
/* USER CODE BEGIN (5) */
/* USER CODE END */
    .intvecs 	: {} palign=8 > VECTORS
    .text    		: {} palign=8 > FLASH0
    .const   		: {} palign=8 > FLASH0
    .cinit    		: {} palign=8 > FLASH0
    .pinit    		: {} palign=8 > FLASH0
    GROUP
	{
        .TI.ramfunc
        { -l rtsv7R4_T_le_v3D16_eabi.lib<memcmp.c.obj>}
//        { -l rtsv7R4_T_le_v3D16_eabi.lib<memcpy_t2.asm.obj>}
        { -l F021_API_CortexR4_LE_L2FMC_V3D16.lib}

	}LOAD > FLASH0
    RUN > RAM
    LOAD_START(_RamfuncsLoadStart)
    LOAD_SIZE(_RamfuncsLoadSize)
    LOAD_END(_RamfuncsLoadEnd)
    RUN_START(_RamfuncsRunStart)
    RUN_SIZE(_RamfuncsRunSize)
    RUN_END(_RamfuncsRunEnd)
    .bss     : {} > RAM
    .data    : {} > RAM
    .sysmem  : {} > RAM

/* USER CODE BEGIN (6) */
	.stack	 : {} > STACKS
	SW_VERSION_DATA		: START(ulSWVERSIONStartAddr) > SW_VERSION
	GOLDEN_CRC_DATA		: START(ulGOLDENCRCStartAddr) > GOLDEN_CRC
/* USER CODE END */
}