I am working with a custom board that uses the STM32H7S38T chip.
I am trying to use the SPI flash example from Zephyr to write to and read from the BY25Q16ES NOR flash. I am using the XSPI interface in normal SPI mode.
I can read out the JEDEC ID (0x9F) as 0x684015, which matches the value given in the datasheet.
When reading the SFDP (0x5A), the MISO is pulled high after the dummy cycles.
Have I overlooked something? The flash datasheet clearly states that the SFDP is available.
Zephyr Debug output:
-------------------------------------
[00:00:00.000,000] <dbg> flash_stm32h7: stm32h7_flash_init: Flash initialized. BS: 32
[00:00:00.000,000] <dbg> flash_stm32h7: stm32h7_flash_init: Block 0: bs: 8192 count: 8
[00:00:00.000,000] <dbg> flash_stm32_xspi: flash_stm32_xspi_init: XSPI Init'd
[00:00:00.100,000] <dbg> flash_stm32_xspi: flash_stm32_xspi_init: Reset Mem (SPI/STR)
[00:00:00.100,000] <dbg> flash_stm32_xspi: HAL_XSPI_StatusMatchCallback: Status Match cb
[00:00:00.100,000] <dbg> flash_stm32_xspi: flash_stm32_xspi_init: Mem Ready (SPI/STR)
[00:00:00.101,000] <dbg> flash_stm32_xspi: stm32_xspi_read_jedec_id: Jedec ID = [68 40 15]
[00:00:00.101,000] <inf> flash_stm32_xspi: OSPI flash config is SPI|DUAL|QUAD / STR
[00:00:00.101,000] <inf> flash_stm32_xspi: Read SFDP from externalFlash
[00:00:00.101,000] <err> flash_stm32_xspi: SFDP magic ffffffff invalid
*** Booting Zephyr OS build v4.3.0 ***
xspi-nor-flash@0: device not ready.
-------------------------------------
I also added the Saleae Logic trace as ZIP to the appendix.
Here is my DTS for the XSPI:
&xspi1 {
pinctrl-0 = <&xspim_p1_clk_po4 &xspim_p1_ncs1_po0
&xspim_p1_io0_pp0 &xspim_p1_io1_pp1
&xspim_p1_io2_pp2 &xspim_p1_io3_pp3>;
pinctrl-names = "default";
status = "okay";
// ssht-enable;
// dlyb-bypass;
BY25Q16ESTIG: xspi-nor-flash@0 {
compatible = "st,stm32-xspi-nor";
reg = <0>;
size = <DT_SIZE_M(2)>; /* 16Mbits */
ospi-max-frequency = <DT_FREQ_M(1)>;
spi-bus-width = <XSPI_SPI_MODE>;
data-rate = <XSPI_STR_TRANSFER>;
// four-byte-opcodes;
// writeoc = "PP_1_1_4";
// writeoc = "PP";
status = "okay";
// jedec-id = [68 40 15];
// quad-enable-requirements = "S2B1v1";
partitions {
compatible = "fixed-partitions";
#address-cells = <1>;
#size-cells = <1>;
slot0_partition: partition@0 {
label = "image-0";
reg = <0x00000000 DT_SIZE_M(1)>;
};
slot1_partition: partition@100000 {
label = "image-1";
reg = <0x00100000 DT_SIZE_M(1)>;
};
// scratch_partition: partition@100000 {
// label = "image-scratch";
// reg = <0x00100000 DT_SIZE_K(64)>;
// };
// storage_partition: partition@110000 {
// label = "storage";
// reg = <0x00110000 DT_SIZE_K(64)>;
// };
};
};
};
