Hello,
We develop the system that based on MIPS that includes Synopsys SPI with NACRONIX SPI flash connected to it. For U-boot we are using version 2019.04-rc4. I want to save environment on SPI flash. For this I enabled the DesignWare SPI driver and MACRONIX SPI flash driver in U-boot .config and add corresponding definitions in our dts file. Following the .config relevant lines:
CONFIG_CMD_SAVEENV=y
CONFIG_DM_SPI_FLASH=y CONFIG_SPI_FLASH=y CONFIG_SPI_FLASH_MACRONIX=y
CONFIG_SPI=y CONFIG_DM_SPI=y CONFIG_SPI_MEM=y CONFIG_DESIGNWARE_SPI=y
Following the dts file relevant lines:
ahb { compatible = "simple-bus";
spi0: spi-master@1FCD0000 { #address-cells = <1>; #size-cells = <0>; compatible = "snps,dw-apb-ssi"; reg = <0x1FCD0000 0x40>; num-chipselect = <4>; bus-num = <0>; reg-io-width = <4>; reg-shift = <2>; spi-max-frequency = <18000000>; /* input clock */
status = "okay";
spi-flash@0 { compatible = "spi-flash"; spi-max-frequency = <18000000>; /* input clock */ reg = <0>; /* CS0 */ }; }; };
In the U-boot startup I get the following error: Loading Environment from SPI Flash... Invalid bus 0 (err=-19) *** Warning - spi_flash_probe_bus_cs() failed, using default environment Also the "sf probe" command gives the similar error:
# sf probe 0:0
Invalid bus 0 (err=-19)
Failed to initialize SPI flash at 0:0 (error -19) The error -19 is ENODEV error.
After the problem evaluation I found that both "load environment" and "sf probe" failed in uclass_find_device_by_seq() function (drivers/core/uclass.c).
This function failed to find device for uclass_id= UCLASS_SPI on bus 0 (spi0). In main there are no devices on this bus.
In both cases the flow is started from spi_flash_probe_bus_cs() function (drivers/mtd/spi/sf-uclass.c) for device "spi_flash@0:0".
In the start of this flow uclass_get() function (drivers/core/uclass.c)) is executed to find UCLASS_SPI driver.
This function returns uclass with driver "spi" and not "dw_spi" as I expected. Also I found that the DesignWare SPI driver probe (designware_spi.c) doesn't even executed.
Can somebody point me on my problem? Or maybe there is some example of working Synopsis SPI with flash definitions in U-boot.
Thanks, Yakov
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