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authorLarry Johnson <lrj@acm.org>2009-01-28 15:30:02 -0500
committerStefan Roese <sr@denx.de>2009-01-29 10:55:56 +0100
commitf20405e31680efc36293c59b4963db57c9d93df4 (patch)
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parentc1b7c70083fc8d0bb77db20dd47bb6c988f3dc67 (diff)
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ppc4xx: Add variable "korat_usbcf" for Korat board
The new environment variable "korat_usbcf" selects the USB port used by the Korat board's CompactFlash controller. Signed-off-by: Larry Johnson <lrj@acm.org> Signed-off-by: Stefan Roese <sr@denx.de>
Diffstat (limited to 'doc/README.korat')
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diff --git a/doc/README.korat b/doc/README.korat
index 0a59f40..49cd102 100644
--- a/doc/README.korat
+++ b/doc/README.korat
@@ -49,3 +49,17 @@ creates the upgradable U-Boot but selecting loader file "u-boot-F7FC.lds" and
leaving preprocessor symbol "CONFIG_KORAT_PERMANENT" undefined.
2008-02-22, Larry Johnson <lrj@acm.org>
+
+
+
+The CompactFlash(R) controller on the Korat board provides a hi-speed USB
+interface. This may be connected to either a dedicated port on the on-board
+USB controller, or to a USB port on the PowerPC 440EPx processor. The U-Boot
+environment variable "korat_usbcf" can be used to specify which of these two
+USB host ports is used for CompactFlash. The valid setting for the variable are
+the strings "pci" and "ppc". If the variable defined and set to "ppc", then the
+PowerPC USB port is used. In all other cases the on-board USB controller is
+used, but if "korat_usbcf" is defined but is set to a string other than the two
+valid options, a warning is also issued.
+
+2009-01-28, Larry Johnson <lrj@acm.org>