From 60aaaa0782848062d0f499382035acc09eaff352 Mon Sep 17 00:00:00 2001 From: Peter Tyser Date: Fri, 22 Oct 2010 00:20:30 -0500 Subject: post/i2c: Rename I2C_ADDR_LIST to CONFIG_SYS_POST_I2C_ADDRS Signed-off-by: Peter Tyser Acked-by: Heiko Schocher Acked-by: Wolfgang Denk Signed-off-by: Kumar Gala --- doc/README.POST | 11 +++++------ 1 file changed, 5 insertions(+), 6 deletions(-) (limited to 'doc/README.POST') diff --git a/doc/README.POST b/doc/README.POST index eeb218d..695497e 100644 --- a/doc/README.POST +++ b/doc/README.POST @@ -659,12 +659,11 @@ 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. 2.2.2.2. Watchdog timer test -- cgit v1.1 From 9d921f19b3f981a499f49a57e2c3ace7be5aeecc Mon Sep 17 00:00:00 2001 From: Peter Tyser Date: Fri, 22 Oct 2010 00:20:31 -0500 Subject: post/i2c: Add ability to ignore I2C devices Add the ability to not report an I2C POST error for a set of given I2C addresses on bootup. This is useful for cases when a device may or may not be present, and neither case is considered an error. For example: - Some form factors such as XMC and Compact PCI Express have an I2C EEPROM whose address changes based on geographical address. Eg installed in one slot its EEPROM address is, 0x50, in another its 0x51, etc. This allows multiple devices to have their EEPROMs present on the same I2C bus. Thus the I2C devices present for an XMC or CPCIe card depend on if and where other cards are installed in the same system. - Some cards have optional I2C devices. Eg one hardware build configuration has different I2C devices than another and software can't determine if the optional device should be present or not. - Some cards have optional daughtercards with I2C devices on them. - I2C EEPROMs address range depends on their size. Its possible to support differently size EEPROMs by only probing the EEPROM's base address and ignoring the other addresses that are impacted by its size. A new CONFIG_SYS_POST_I2C_IGNORES define has been added which specifies a list of I2C addresses for the I2C POST to ignore. Signed-off-by: Peter Tyser Acked-by: Heiko Schocher Acked-by: Wolfgang Denk Signed-off-by: Kumar Gala --- doc/README.POST | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'doc/README.POST') diff --git a/doc/README.POST b/doc/README.POST index 695497e..6815d49 100644 --- a/doc/README.POST +++ b/doc/README.POST @@ -665,6 +665,14 @@ 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 To test the watchdog timer the scheme mentioned above (refer to -- cgit v1.1