xref: /openbmc/u-boot/doc/SPI/README.sandbox-spi (revision 9c7dea60)
1Sandbox SPI/SPI Flash Implementation
2====================================
3
4U-Boot supports SPI and SPI flash emuation in sandbox. This must be enabled
5using the --spi_sf paramter when starting U-Boot.
6
7For example:
8
9$ make O=sandbox sandbox_config
10$ make O=sandbox
11$ ./sandbox/u-boot --spi_sf 0:0:W25Q128:b/chromeos_peach/out/image.bin
12
13The four parameters to spi_sf are:
14
15   SPI bus number (typically 0)
16   SPI chip select number (typically 0)
17   SPI chip to emulate
18   File containing emulated data
19
20Supported chips are W25Q16 (2MB), W25Q32 (4MB) and W25Q128 (16MB). Once
21U-Boot it started you can use 'sf' commands as normal. For example:
22
23$ ./b/sandbox/u-boot --spi_sf 0:0:W25Q128:b/chromeos_peach/out/image.bin \
24	-c "sf probe; sf test 0 100000; sf read 0 1000 1000; \
25		sf erase 1000 1000; sf write 0 1000 1000"
26
27
28U-Boot 2013.10-00237-gd4e0fdb (Nov 07 2013 - 20:08:15)
29
30DRAM:  128 MiB
31Using default environment
32
33In:    serial
34Out:   serial
35Err:   serial
36SF: Detected W25Q128BV with page size 256 Bytes, erase size 4 KiB, total 16 MiB
37SPI flash test:
380 erase: 1 ticks, 1024000 KiB/s 8192.000 Mbps
391 check: 2 ticks, 512000 KiB/s 4096.000 Mbps
402 write: 6 ticks, 170666 KiB/s 1365.328 Mbps
413 read: 0 ticks, 1048576000 KiB/s -201326.-592 Mbps
42Test passed
430 erase: 1 ticks, 1024000 KiB/s 8192.000 Mbps
441 check: 2 ticks, 512000 KiB/s 4096.000 Mbps
452 write: 6 ticks, 170666 KiB/s 1365.328 Mbps
463 read: 0 ticks, 1048576000 KiB/s -201326.-592 Mbps
47SF: 4096 bytes @ 0x1000 Read: OK
48SF: 4096 bytes @ 0x1000 Erased: OK
49SF: 4096 bytes @ 0x1000 Written: OK
50
51
52Since the SPI bus is fully implemented as well as the SPI flash connected to
53it, you can also use low-level SPI commands to access the flash. For example
54this reads the device ID from the emulated chip:
55
56=> sspi 0 32 9f
57FFEF4018
58
59
60Simon Glass
61sjg@chromium.org
627/11/2013
63Note that the sandbox SPI implementation was written by Mike Frysinger
64<vapier@gentoo.org>.
65