mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-10 15:14:43 +00:00
1cc0a9f496
Spelling corrections for (among other things): * environment * override * variable * ftd (should be "fdt", for flattened device tree) * embedded * FTDI * emulation * controller
64 lines
1.9 KiB
Text
64 lines
1.9 KiB
Text
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.
|
|
|
|
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
|
|
|
|
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
|
|
|
|
|
|
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
|
|
|
|
|
|
Simon Glass
|
|
sjg@chromium.org
|
|
7/11/2013
|
|
Note that the sandbox SPI implementation was written by Mike Frysinger
|
|
<vapier@gentoo.org>.
|