[U-Boot,08/12] am335x_evm: Update README for customization

Message ID 1377003234-16792-9-git-send-email-trini@ti.com
State Accepted
Delegated to: Tom Rini
Headers show

Commit Message

Tom Rini Aug. 20, 2013, 12:53 p.m.
As this is a reference platform, update the README to note which IP
blocks are required for use due to design choices of the reference
rather than required by the SoC itself.

Signed-off-by: Tom Rini <trini@ti.com>
 board/ti/am335x/README |   28 +++++++++++++++++++++++++++-
 1 file changed, 27 insertions(+), 1 deletion(-)


diff --git a/board/ti/am335x/README b/board/ti/am335x/README
index 67b5246..2a30ab8 100644
--- a/board/ti/am335x/README
+++ b/board/ti/am335x/README
@@ -13,7 +13,33 @@  documented in TI's reference designs:
 - AM335x EVM SK
 - Beaglebone White
 - Beaglebone Black
+Given that all of the above boards are reference platforms (and the
+Beaglebone platforms are OSHA), it is likely that this platform code and
+configuration will be used as the basis of a custom platform.  It is
+worth noting that aside from things such as NAND or MMC only being
+required if a custom platform makes use of these blocks, the following
+are required, depending on design:
+- GPIO is only required if DDR3 power is controlled in a way similar to
+- SPI is only required for SPI flash, or exposing the SPI bus.
+The following blocks are required:
+- I2C, to talk with the PMIC and ensure that we do not run afoul of
+  errata 1.0.24.
+When removing options as part of customization,
+CONFIG_EXTRA_ENV_SETTINGS will need additional care to update for your
+needs and to remove no longer relevant options as in some cases we
+define additional text blocks (such as for NAND or DFU strings).  Also
+note that all of the SPL options are grouped together, rather than with
+the IP blocks, so both areas will need their choices updated to reflect
+the custom design.