STM32 QSPI Flash memory mapped mode

[RIPHeisenberg]

Hi everyone,

I am currently trying to use the QSPI Flash API of the STM32H747I_DISCOVERY_M7 chip.

Zephyr version 3.7 LTS
Board STM32H747I_DISCOVERY_M7

What I have tried so far:
KCONFIG:
CONFIG_STDOUT_CONSOLE=y
CONFIG_FLASH=y
CONFIG_SPI=y

CONFIG_GPIO=y
CONFIG_FLASH=y
CONFIG_FLASH_STM32_QSPI=y
CONFIG_STM32_MEMMAP=y

CONFIG_PRINTK=y
CONFIG_SHELL=y
CONFIG_LOG=y
CONFIG_FLASH=y
CONFIG_FLASH_SHELL=y
CONFIG_FLASH_SHELL_TEST_COMMANDS=y

Device Tree:
quadspi: quadspi@52005000 {
compatible = "st,stm32-qspi";
#address-cells = < 0x1 >;
#size-cells = < 0x0 >;
reg = < 0x52005000 0x34 >;
interrupts = < 0x5c 0x0 >;
clocks = < &rcc 0xd4 0x4000 >;
status = "okay";
pinctrl-0 = < &quadspi_clk_pb2 &quadspi_bk1_ncs_pg6 &quadspi_bk1_io0_pd11 &quadspi_bk1_io1_pf9
&quadspi_bk1_io2_pf7 &quadspi_bk1_io3_pf6 &quadspi_bk2_io0_ph2 &quadspi_bk2_io1_ph3 &quadspi_bk2_io2_pg9 &quadspi_bk2_io3_pg14 >;
pinctrl-names = "default";
dual-flash;
mt25ql512ab1: qspi-nor-flash-1@90000000 {
compatible = "st,stm32-qspi-nor";
reg = < 0x90000000 0x4000000 >;
qspi-max-frequency = < 0x44aa200 >;
spi-bus-width = < 0x4 >;
status = "okay";
partitions {
compatible = "fixed-partitions";
#address-cells = < 0x1 >;
#size-cells = < 0x1 >;
slot0_partition: partition@0 {
reg = < 0x0 0x200000 >;
label = "image-0";
};
};
};

Example: samples/drivers/spi_flash

Following output is generated:

[00:00:00.000,000] <inf> flash_stm32_qspi: Reading SFDP
[00:00:00.000,000] <inf> flash_stm32_qspi: qspi-nor-flash-1@90000000: SFDP v 1.6 AP ff with 2 PH
[00:00:00.000,000] <inf> flash_stm32_qspi: PH0: ff00 rev 1.6: 16 DW @ 30
[00:00:00.000,000] <inf> flash_stm32_qspi: Reading SFDP
[00:00:00.000,000] <inf> flash_stm32_qspi: qspi-nor-flash-1@90000000: 128 MiBy flash
[00:00:00.000,000] <inf> flash_stm32_qspi: Flash - address mode: 4B
[00:00:00.000,000] <inf> flash_stm32_qspi: Quad read mode 4 instr [0x6b] supported
[00:00:00.000,000] <inf> flash_stm32_qspi: Quad read mode 7 instr [0xeb] supported
[00:00:00.000,000] <inf> flash_stm32_qspi: Quad read mode 7 instr [0xeb] will be used
[00:00:00.000,000] <inf> flash_stm32_qspi: QE requirement mode: 0
[00:00:00.000,000] <inf> flash_stm32_qspi: Quad mode enabled
[00:00:00.000,000] <inf> flash_stm32_qspi: PH1: ff84 rev 1.0: 2 DW @ 80
[00:00:00.000,000] <inf> flash_stm32_qspi: Memory-mapped NOR quad-flash at 0x90000000 (0x8000000 bytes)
*** Booting Zephyr OS build v3.7.0-506-g832261dbe5d7 ***
uart:~$ 
qspi-nor-flash-1@90000000 SPI flash testing
==========================

Perform test on single sector
Test 1: Flash erase
Flash erase failed! -22

Test 2: Flash write
Attempting to write 4 bytes
Flash write failed! -22

Perform test on multiple consecutive sectors
Test 1: Flash erase
Flash erase failed! -22

Test 2: Flash write
Attempting to write 4 bytes at offset 0x90000000
Flash write failed! -22

I tried it with region offset 0x990000000 and 0x0.
neither of which worked.
SPI Sector size 4096

Is it possible to use the QSPI flash in Memory mapped mode? What am I missing? Some help is highly appreciated.

Best regards
Maikel Schuurmans Stekhoven

[erwango]

@FRASTM ^^

[mariopaja]

@RIPHeisenberg if you want to implement memory mapped mode, you can have a look at this sample https://github.com/zephyrproject-rtos/zephyr/tree/main/samples/application_development/code_relocation_nocopy

I have already used this sample with a nucleo_h745zi_q and an external flash memory and it worked like a charm. The only think you would keep in mind is the linker needed for the flash memory. I dont know if it is implemented for your board.

[RIPHeisenberg]

Hi @mariopaja @FRASTM

Thanks for your responds. I have some nucleo_h745 boards at work. I'll try out your suggestion. Thanks a lot for the support. I assume you add a external flash to the board via the QSPI pinout, right? The nucleo_h745 doesn't have a internal QSPI flash as far as I know.

[RIPHeisenberg]

Do you use the cube programmer to load code to the external flash? Is there a more "Zephyr" way of doing this?
Not that I would mind using the cube programmer

[mariopaja]

@RIPHeisenberg

I assume you add a external flash to the board via the QSPI pinout, right? The nucleo_h745 doesn't have a internal QSPI flash as far as I know.

exactly

Do you use the cube programmer to load code to the external flash? Is there a more "Zephyr" way of doing this? Not that I would mind using the cube programmer

you can use --runner stm32cubeprogrammer

Just keep in mind that you need an external loader to make it work (xxxxxx.stldr). They are platform, pinout (I might be wrong on this), and flash memory specific.

[RIPHeisenberg]

Thanks! I hoped I could avoid writing a external loader. It seems like a very cumbersome process...
But it makes sense that this has to be done for a custom Flash chip.

[mariopaja]

@RIPHeisenberg I didnt write a loader either. I was lucky enough to find the right one for my test application here https://github.com/cturvey/stm32extldr

It would be nice if there would be a more straightforward way to use the flash memories or write the loaders

[FRASTM]

Hi @RIPHeisenberg

The stm32 qspi driver cannot write or erase in memory mapped mode. Only reading is possible (memcopy). With the spi_flash sample, setting memory mapped and aborting memory mapped mode can disturb the access to the quad-spi flash.