diff options
| author | Wolfgang Denk <wd@denx.de> | 2010-10-23 21:59:42 +0200 |
|---|---|---|
| committer | Wolfgang Denk <wd@denx.de> | 2010-10-23 21:59:42 +0200 |
| commit | f2b382ea066d02d5ba44870024cc1295e85782ef (patch) | |
| tree | 9891424412f40e0bbe3cb64d022597bffa301b50 /doc | |
| parent | 33a08c10c78baf67e41cd03d5732ddc338e8c2e9 (diff) | |
| parent | bfe18815e8123f4456be8b5858b2b255d7881698 (diff) | |
Merge branch 'master' of git://git.denx.de/u-boot-mpc85xx
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/README.POST | 19 |
1 files changed, 13 insertions, 6 deletions
diff --git a/doc/README.POST b/doc/README.POST index eeb218d39..6815d491c 100644 --- a/doc/README.POST +++ b/doc/README.POST @@ -659,12 +659,19 @@ not need any modifications for porting them to another board/CPU. 2.2.2.1. I2C test For verifying the I2C bus, a full I2C bus scanning will be performed -using the i2c_probe() routine. If any I2C device is found, the test -will be considered as passed, otherwise failed. This particular way -will be used because it provides the most common method of testing. -For example, using the internal loopback mode of the CPM I2C -controller for testing would not work on boards where the software -I2C driver (also known as bit-banged driver) is used. +using the i2c_probe() routine. If a board defines +CONFIG_SYS_POST_I2C_ADDRS the I2C test will pass if all devices +listed in CONFIG_SYS_POST_I2C_ADDRS are found, and no additional +devices are detected. If CONFIG_SYS_POST_I2C_ADDRS is not defined +the test will pass if any I2C device is found. + +The CONFIG_SYS_POST_I2C_IGNORES define can be used to list I2C +devices which may or may not be present when using +CONFIG_SYS_POST_I2C_ADDRS. The I2C POST test will pass regardless +if the devices in CONFIG_SYS_POST_I2C_IGNORES are found or not. +This is useful in cases when I2C devices are optional (eg on a +daughtercard that may or may not be present) or not critical +to board operation. 2.2.2.2. Watchdog timer test |