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imx: fec: add MAC reading from eFuses to README

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Extend the documentation of the fec_mxc configuration by describing its
ability to read the ethaddr MAC address from the SoC eFuses.

Also add an example how to program the fuses for an imx5 to clarify the
byte order.

Cc: Stefano Babic <sbabic at denx.de>
Cc: Marek Vasut <marex at denx.de>
Signed-off-by: Olaf Mandel <o.mandel at menlosystems.com>
This commit is contained in:
Olaf Mandel 2015-05-28 14:59:18 +02:00 committed by Stefano Babic
parent d0d005b616
commit 95c69223f9
2 changed files with 20 additions and 1 deletions
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9
doc/README.fec_mxc
View file

@ -1,7 +1,8 @@
U-boot config options used in fec_mxc.c
CONFIG_FEC_MXC
Selects fec_mxc.c to be compiled into u-boot.
Selects fec_mxc.c to be compiled into u-boot. Can read out the
ethaddr from the SoC eFuses (see below).
CONFIG_MII
Must be defined if CONFIG_FEC_MXC is defined.
@ -25,3 +26,9 @@ CONFIG_FEC_MXC_NO_ANEG
CONFIG_FEC_MXC_PHYADDR
Optional, selects the exact phy address that should be connected
and function fecmxc_initialize will try to initialize it.
Reading the ethaddr from the SoC eFuses:
if CONFIG_FEC_MXC is defined and the U-Boot environment does not contain the
ethaddr variable, then its value gets read from the corresponding eFuses in
the SoC. See the README files of the specific SoC for details.

12
doc/README.imx5
View file

@ -26,3 +26,15 @@ i.MX5x SoCs.
2.1 MAC Address: It is stored in the words 9 to 14 of fuse bank 1, using the
natural MAC byte order (i.e. MSB first).
This is an example how to program an example MAC address 01:23:45:67:89:ab
into the eFuses. Assure that the programming voltage is available and then
execute:
=> fuse prog -y 1 9 01 23 45 67 89 ab
After programming a MAC address, consider locking the MAC fuses. This is
done by programming the MAC_ADDR_LOCK fuse, which is bit 4 of word 0 in
bank 1:
=> fuse prog -y 1 0 10