Porting to a new board
Allen Kennedy Jr.
allen at kennedystuff.com
Wed Sep 18 17:44:29 EDT 2013
Hello,
I have read the documentation but I believe it to be out of date, as it
does not match up with the source from the git tree.
To that end, I am trying to add a new board, and I can not figure out how
to do so. My board uses the mx27 processor, and so I am attempting to
closely mimic one of the other mx27 boards, when following the steps here:
http://barebox.org/documentation/barebox-2011.05.0/dev_board.html
I find the following inconsistencies:
1. include/configs/<boardname>.h -
the configs directory does not exist.
2. modify arch/<architecture>/Kconfig
- add your board (MACH_*) to the list
- add your default text base address for this architecture
(ARCH_TEXT_BASE)
- add BOARDINFO with valueable info for your board
None of this exists.
3. modify arch/<architecture>/Makefile:
- add board-$(MACH_*) = <your board_dir>
This does not exist
And my board will not show up in the menu config.
Also I am finding it difficult to locate where I set things like flash
size, ram size, etc... u-boot has a much simpler (if not less documented)
layout when it came to boards. Alas I can not use u-boot, because of the
nand flash limitations, and thus why I am attempting to use barebox.
And finally there seems to be some confusiton both in the code and the
documentation about the difference between a board and a machine. What is
the difference?
I'm sorry that there is a lot here, but I can not find the proper
documentation to answer these questions.
Also, for those that are curious, or can help me get around this issue. I
attempting to get this going on a board with an mx27 booted from NAND
flash, so I believe I have to use the PBL option to setup and copy out of
nand to do the real booting. If there is any advice on this, I would
appreciate it. I have no other bootloader, only bare metal and a JTAG
device.
thank you.
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