am4378 uboot 读写qspi都返回0的问题

我用的AM4378,链接的spansion  S25FL512SAIF01 qspi flash。设备配置如下:

quad read， pinmux option 1

arch\arm\dts\am4372.dtsi   中：

  qspi: qspi@47900000 {
   compatible = "ti,am4372-qspi";
   reg = <0x47900000 0x100>,
         <0x30000000 0x4000000>;
   reg-names = "qspi_base", "qspi_mmap";
   #address-cells = <1>;
   #size-cells = <1>;
   ti,hwmods = "qspi";
   status = "disabled";
  };

arch\arm\dts\am437x-gp-evm.dts 中：

&qspi {
 status = "okay";
 pinctrl-names = "default";
 pinctrl-0 = <&qspi_pins_default>;

 spi-max-frequency = <48000000>;

 w25q256@0 {
 compatible = "spi_flash";
 spi-max-frequency = <48000000>;
 spi-cpol;
 spi-cpha;
 spi-tx-bus-width = <1>;
 spi-rx-bus-width = <1>;
 #address-cells = <1>;
 #size-cells = <1>;
 };
};

不知道这样配置对不对？

yun zhong：

=> sf probe 0 0
SF: Detected s25fl512s_256k with page size 512 Bytes, erase size 256 KiB, total 64 MiB, mapped at 30000000
–读出来的ID也为0，这里是强制赋的ID值。

=> sf read 0x82000000 0x0 0x100000
device 0 offset 0x0, size 0x100000
SF: 1048576 bytes @ 0x0 Read: OK

=> md.b 0x82000000
82000000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00…………….
82000010: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00…………….
82000020: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00…………….
82000030: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00…………….
=>

yongqing wang：

回复 yun zhong:

参考一下这个帖子：e2e.ti.com/…/1751934

Shine：

回复 yun zhong:

用示波器看一下SPI管脚时序。