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doc/README.fec_mxc: add documentation

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Signed-off-by: Troy Kisky <troy.kisky@boundarydevices.com>
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Troy Kisky 2012-10-22 16:40:39 +00:00 committed by Stefano Babic
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U-boot config options used in fec_mxc.c
CONFIG_FEC_MXC
Selects fec_mxc.c to be compiled into u-boot.
CONFIG_MII
Must be defined if CONFIG_FEC_MXC is defined.
CONFIG_FEC_XCV_TYPE
Defaults to MII100 for 100 Base-tx.
RGMII selects 1000 Base-tx reduced pin count interface.
RMII selects 100 Base-tx reduced pin count interface.
CONFIG_FEC_MXC_SWAP_PACKET
Forced on iff MX28.
Swaps the bytes order of all words(4 byte units) in the packet.
This should not be specified by a board file. It is cpu specific.
CONFIG_PHYLIB
fec_mxc supports PHYLIB and should be used for new boards.
CONFIG_FEC_MXC_NO_ANEG
Relevant only if PHYLIB not used. Skips auto-negotiation restart.
CONFIG_FEC_MXC_PHYADDR
Optional, selects the exact phy address that should be connected
and function fecmxc_initialize will try to initialize it.