Parallel QSPI not working in Vybrid Cortex A5

[muhammad_qasim]

Hi

I am working on PARALLEL QSPI for Vybrid Custom Board and currently unable to boot the board (When image was flashed for non-parallel mode, Boot is successful) Here is my QSPI configuration

const SFLASH_CONFIGURATION_PARAM quadspi_conf __attribute__ ((section ("conf")))= {

  0,                      /* Reserved 0 */

  0,                      /* Hold Delay for QSPI[0,1] A/B */

  0,                      /* Select sampling at non-inverted clock */

  0,                      /* One Clock cycle delay */

  0,                      /* Reserved 1 */

  {0,                     /* Reserved 2 */

  0,                      /* Reserved 3 */

  0},                     /* Reserved 4 */

  0,                      /* cs_hold_time */

  0,                      /* cs_setup_time */

  0x1000000,              /* A1 flash size - 16MB (This is not a dual die flash) */

  0,                      /* A2 flash size (This is not a dual die flash) */

  0x1000000,              /* B1 flash size - 16MB` (This is not a dual die flash) */

  0,                      /* B2 flash size (This is not a dual die flash) */

  3,                      /* SCLK Frequency (0-18MHz, 1-60MHz, 2-74MHz, 3-104 MHz (SDR Mode) ) */

  0,                      /* Reserved 5*/

  4,                      /* Quad Mode Flash (4-bit) */

  1,                      /* Port A is always available. This field informs the device ROM the availability of Port B. 0 - Port B is not used. 1 - Port B is used */

  0,                      /* Dual Data Rate (DDR) Mode Disable */

  0,                      /* Data Strobe signal (DQS) Disable */

  1,                      /* Parallel Mode Disable (This field enables the device ROM to configure the QSPI interface

                             in parallel mode. Data will be read from serial Flash in parallel mode. ) */

  0,                      /* Disable Port A CS1 */

  0,                      /* Disable Port B CS1 */

  0,                      /* FS Phase (Select sampling at non-inverted clock) */

  0,                      /* FS Delay (One clock cycle delay) */

  0,                      /* DDR Sampling (Select the sampling point for incoming data when serial flash is in DDR mode) */

  /* LUT Programming */

  /* Quad read*/

  {0x04EB,   /* Instruction - (CMD-1)       || 1 - Pads || QIOR - Quad IO Read (3 or 4-byte address) */

   0x0A18,   /* Instruction - (ADDR-2)      || 4 - Pads || 24 bit address */

   0x12A5,   /* Instruction - (MODE-4)      || 4 - Pads || Remain in QIOR */

   0x0E04,   /* Instruction - (DUMMY-3)     || 4 - Pads || 4 Dummy Cycles */

   0x1E80,   /* Instruction - (READ-7)      || 4 - Pads || 128 Bytes */

   0x2401}   /* Instruction - (JMP_ON_CS-9) || 1 - Pads || to 1 */

};

Is these settings correct?

In my programme of flashing the binary image, I have adapted the following scheme.

#define  HEADER_SIZE 2048 // Also checked for 512

1. Split the original image (total_image_size-HEADER_SIZE) into "d1" and "d2" arrays

2. Copy Boot Configuration Header of "HEADER_SIZE" Bytes [1024 + 32 + 16 + 976 i.e. conf + IVT + boot_data_qspi + DCD] into "h_d" array from original image

3. Copy the "d1" array into "h_d" (after header). Now "h_d" contains Boot Configuration Header of "HEADER_SIZE" Bytes and then "d1" array

4. Flash "h_d" into Flash A

5. Flash "d2" into Flash B (start at HEADER_SIZE of Flash i.e. 0x21000800)

6. Set the Quad Bit to 1 in Flash Configuration Register 1 which is non-volatile bit.

7. Invalidate the TX and RX buffers (bits 10 and 11)

8. Set Parallel mode bit (Bit 16 of BFGENCR register)

where

I have barrowed split.c file. Is code provided in split.c considering quad mode bit settings?

Note:

1. The chip in use is Spansion FL128SAIF00 (SDR not DDR)

2. In Freescale "Document Number: TWRVF65GS10UG Rev. 1.2, 08/2014 Section 2.8", It is written that "QuadSPI interface supports Parallel QuadSPI operation in DDR mode." My chip is SDR so can I claim that "QuadSPI interface does not supports Parallel QuadSPI operation in SDR mode."

Regards

[karina_valencia]

alejandrolozano​ are you able to help here?

[alejandrolozan1]

Hi Karina,

I believe that muhammad_qasim​ already has the answer to this. But let me add the summary here:

Primary problem found was in the Spansion Flash CR1[1]=1 is a non-volatile bit. They are clearing this bit and leaving the flash in non-quad mode but setting this bit in "SFLASH_CONFIGURATION_PARAM" so BOOT ROM code was confused. After explicitly setting this bit in the application to align "SFLASH_CONFIGURATION_PARAM" and Spansion FLASH quad bit settings. Initially, they were setting this bit for Flash A1 but not for Flash B1.  Setting this bit for B1 fixed it.

/Alejandro