@@ -2,59 +2,37 @@ Sandbox SPI/SPI Flash Implementation
====================================
U-Boot supports SPI and SPI flash emulation in sandbox. This must be enabled
-using the --spi_sf paramter when starting U-Boot.
+via a device tree.
For example:
-$ make O=sandbox sandbox_config
-$ make O=sandbox
-$ ./sandbox/u-boot --spi_sf 0:0:W25Q128:b/chromeos_peach/out/image.bin
-
-The four parameters to spi_sf are:
-
- SPI bus number (typically 0)
- SPI chip select number (typically 0)
- SPI chip to emulate
- File containing emulated data
+ spi at 0 {
+ #address-cells = <1>;
+ #size-cells = <0>;
+ reg = <0 1>;
+ compatible = "sandbox,spi";
+ cs-gpios = <0>, <&gpio_a 0>;
+ spi.bin at 0 {
+ reg = <0>;
+ compatible = "spansion,m25p16", "jedec,spi-nor";
+ spi-max-frequency = <40000000>;
+ sandbox,filename = "spi.bin";
+ };
+ };
Supported chips are W25Q16 (2MB), W25Q32 (4MB) and W25Q128 (16MB). Once
U-Boot it started you can use 'sf' commands as normal. For example:
-$ ./b/sandbox/u-boot --spi_sf 0:0:W25Q128:b/chromeos_peach/out/image.bin \
- -c "sf probe; sf test 0 100000; sf read 0 1000 1000; \
- sf erase 1000 1000; sf write 0 1000 1000"
-
-
-U-Boot 2013.10-00237-gd4e0fdb (Nov 07 2013 - 20:08:15)
-
-DRAM: 128 MiB
-Using default environment
-
-In: serial
-Out: serial
-Err: serial
-SF: Detected W25Q128BV with page size 256 Bytes, erase size 4 KiB, total 16 MiB
-SPI flash test:
-0 erase: 1 ticks, 1024000 KiB/s 8192.000 Mbps
-1 check: 2 ticks, 512000 KiB/s 4096.000 Mbps
-2 write: 6 ticks, 170666 KiB/s 1365.328 Mbps
-3 read: 0 ticks, 1048576000 KiB/s -201326.-592 Mbps
-Test passed
-0 erase: 1 ticks, 1024000 KiB/s 8192.000 Mbps
-1 check: 2 ticks, 512000 KiB/s 4096.000 Mbps
-2 write: 6 ticks, 170666 KiB/s 1365.328 Mbps
-3 read: 0 ticks, 1048576000 KiB/s -201326.-592 Mbps
-SF: 4096 bytes @ 0x1000 Read: OK
-SF: 4096 bytes @ 0x1000 Erased: OK
-SF: 4096 bytes @ 0x1000 Written: OK
-
+$ dd if=/dev/zero of=spi.bin bs=1M count=2
+$ u-boot -T
Since the SPI bus is fully implemented as well as the SPI flash connected to
it, you can also use low-level SPI commands to access the flash. For example
this reads the device ID from the emulated chip:
=> sspi 0 32 9f
-FFEF4018
+SF: Detected m25p16 with page size 256 Bytes, erase size 64 KiB, total 2 MiB
+FF202015
Simon Glass
@@ -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 at 0 {
+ #address-cells = <1>;
+ #size-cells = <0>;
+ reg = <0 1>;
+ compatible = "sandbox,spi";
+ cs-gpios = <0>, <&gpio_a 0>;
+ spi.bin at 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
----------------------
Since the commit 1289e96797bf ("sandbox: spi: Drop command-line SPI option"), "--spi_sf" command line option is no longer supported. So update the following documents to sync them up with the change. doc/arch/sandbox.rst doc/SPI/README.sandbox-spi Signed-off-by: AKASHI Takahiro <takahiro.akashi at linaro.org> --- doc/SPI/README.sandbox-spi | 58 ++++++++++++-------------------------- doc/arch/sandbox.rst | 52 +++++++++++++++------------------- 2 files changed, 41 insertions(+), 69 deletions(-)