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arm: mvebu: Espressobin: Update README.marvell file

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Include information about permanent ethernet MAC address and add link how
to build ATF as U-Boot on Espressobin cannot be flashed without ATF.

Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Stefan Roese <sr@denx.de>
This commit is contained in:
Pali Rohár 2020-08-27 15:01:28 +02:00 committed by Stefan Roese
parent 6b61066210
commit 64430efe69
1 changed files with 37 additions and 3 deletions
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doc/README.marvell
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@ -13,7 +13,8 @@ Build Procedure
2. Set the cross compiler:
# export CROSS_COMPILE=/path/to/toolchain/aarch64-marvell-linux-gnu-
# sudo apt-get install gcc-aarch64-linux-gnu
# export CROSS_COMPILE=aarch64-linux-gnu-
3. Clean-up old residuals:
@ -30,7 +31,7 @@ Build Procedure
5. Configure the device-tree and build the U-Boot image:
Compile u-boot and set the required device-tree using:
For the Armada-70x0/80x0 DB board compile u-boot and set the required device-tree using:
# make DEVICE_TREE=<name>
@ -42,12 +43,45 @@ Build Procedure
In order to prevent this, the required device-tree MUST be set during compilation.
All device-tree files are located in ./arch/arm/dts/ folder.
For other DB boards (MacchiatoBin, EspressoBin and 3700 DB board) compile u-boot with
just default device-tree from defconfig using:
# make
NOTE:
The u-boot.bin should not be used as a stand-alone image.
The ARM Trusted Firmware (ATF) build process uses this image to generate the
flash image.
flash image. See TF-A Build Instructions for Marvell Platforms for more details at:
https://trustedfirmware-a.readthedocs.io/en/latest/plat/marvell/armada/build.html
Configuration update
---------------------
To update the U-Boot configuration, please refer to doc/README.kconfig
Permanent ethernet MAC address
-------------------------------
Prior flashing new U-Boot version (as part of ATF image) it is suggested to backup
permanent ethernet MAC address as it is stored only in U-Boot env storage (SPI or eMMC).
Some boards like EspressoBin have MAC address printed on sticker. To print current MAC
address run:
# echo $ethaddr
MAC addresses 00:51:82:11:22:00, 00:51:82:11:22:01, 00:51:82:11:22:02, 00:51:82:11:22:03
and F0:AD:4E:03:64:7F are default hardcoded values found in Marvell's and Armbian U-Boot
forks and therefore *not* unique. Usage of static hardcoded MAC addresses should be avoided.
When original address is lost (e.g. erased by Armbian boot scripts for EspressoBin) it is
suggested to generate new random one.
After flashing new U-Boot version it is suggested to reset U-Boot env variables to default
and then set correct permanent ethernet MAC address.
# env default -a
# setenv ethaddr XX:XX:XX:XX:XX:XX
# saveenv
Where XX:XX:XX:XX:XX:XX is permanent ethernet MAC address.
Recent Linux kernel versions use correct permanent ethernet MAC address from U-Boot env as
U-Boot will inject it into kernel's device-tree.