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Diffstat (limited to 'doc/arch/sandbox.rst')
| -rw-r--r-- | doc/arch/sandbox.rst | 52 |
1 files changed, 23 insertions, 29 deletions
diff --git a/doc/arch/sandbox.rst b/doc/arch/sandbox.rst index 6a1c6fc552..360f22461a 100644 --- a/doc/arch/sandbox.rst +++ b/doc/arch/sandbox.rst @@ -316,19 +316,29 @@ SPI Emulation Sandbox supports SPI and SPI flash emulation. -This is controlled by the spi_sf argument, the format of which is:: - - bus:cs:device:file - - bus - SPI bus number - cs - SPI chip select number - device - SPI device emulation name - file - File on disk containing the data - -For example:: - - dd if=/dev/zero of=spi.bin bs=1M count=4 - ./u-boot --spi_sf 0:0:M25P16:spi.bin +The device can be enabled via a device tree, for example:: + + spi@0 { + #address-cells = <1>; + #size-cells = <0>; + reg = <0 1>; + compatible = "sandbox,spi"; + cs-gpios = <0>, <&gpio_a 0>; + spi.bin@0 { + reg = <0>; + compatible = "spansion,m25p16", "jedec,spi-nor"; + spi-max-frequency = <40000000>; + sandbox,filename = "spi.bin"; + }; + }; + +The file must be created in advance:: + + $ dd if=/dev/zero of=spi.bin bs=1M count=2 + $ u-boot -T + +Here, you can use "-T" or "-D" option to specify test.dtb or u-boot.dtb, +respectively, or "-d <file>" for your own dtb. With this setup you can issue SPI flash commands as normal:: @@ -346,22 +356,6 @@ also use low-level SPI commands:: This is issuing a READ_ID command and getting back 20 (ST Micro) part 0x2015 (the M25P16). -Drivers are connected to a particular bus/cs using sandbox's state -structure (see the 'spi' member). A set of operations must be provided -for each driver. - - -Configuration settings for the curious are: - -CONFIG_SANDBOX_SPI_MAX_BUS: - The maximum number of SPI buses supported by the driver (default 1). - -CONFIG_SANDBOX_SPI_MAX_CS: - The maximum number of chip selects supported by the driver (default 10). - -CONFIG_SPI_IDLE_VAL: - The idle value on the SPI bus - Block Device Emulation ---------------------- |