[U-Boot] MIPS: 1Mb U-Boot?
sr at denx.de
Fri Sep 7 08:33:14 CEST 2012
On 09/07/2012 12:31 AM, Downey, David (c) wrote:
> I'm David Downey, a software engineer at MIPS Technologies.
> Currently, our Malta and SEAD-3 dev boards use YAMON, MIPS' in-house
> open source PROM monitor, as a boot loader. We are looking to migrate
> YAMON's functionality to U-Boot.
> YAMON contains many features beyond the scope of a boot loader (e.g.
> bi-endianess, a EJTAG/GDB interface, a disassembler, etc.) that we
> would still like to make available to our customers. As you might
> expect, these features result in a large image size. (YAMON is 1 Mb,
> which is significantly larger than U-Boot's stated design max. of 256 Kb.)
> Would there be any objection (legal or otherwise) to offering a "lean"
> (> 256 Kb) version of U-Boot for Malta/SEAD-3 through denx.de and a
> "deluxe" (~1 Mb) version of U-Boot (open source, of course) through
> developer.mips.com? If there are objections, do you have any suggestions
> on how we can still offer these features to our customers while not
> breaking U-Boot's 256 Kb design rule?
AFAIK, there is no 256KiB design rule in U-Boot. At least none that is
strict. I maintain many U-Boot board ports. Some of them are even bigger
than 512KiB (enabling features like USB, UBI, UBIFS are quite "expensive").
And I don't see a problem with supporting your "deluxe" features in the
mainline U-Boot git repository at denx.de. As far as the code is in good
shape (see  and ). But you are of course entitled to host your own
git repository, if this is the way you prefer to handle it. Even though
such out-of-tree ports/features are a maintenance nightmare.
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