spi: Add SPI flash test

It is useful to have a basic SPI flash test, which tests that the SPI chip,
the SPI bus and the driver are behaving.

This test erases part of the flash, writes data and reads it back as a
sanity check that all is well.

Use CONFIG_SF_TEST to enable it.

Signed-off-by: Simon Glass <sjg@chromium.org>

1 files changed, 5 insertions, 0 deletions

diff --git a/README b/README
index f386041140..1d2e1297d6 100644
--- a/README
+++ b/README
@@ -2390,6 +2390,11 @@ CBFS (Coreboot Filesystem) support
                 CONFIG_SF_DEFAULT_MODE          (see include/spi.h)
                 CONFIG_SF_DEFAULT_SPEED         in Hz
 
+                CONFIG_CMD_SF_TEST
+
+                Define this option to include a destructive SPI flash
+                test ('sf test').
+
 - SystemACE Support:
                 CONFIG_SYSTEMACE