From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Downey Date: Mon, 10 Sep 2012 16:39:17 -0700 Subject: [U-Boot] MIPS: 1Mb U-Boot? In-Reply-To: <5049952A.3010000@denx.de> References: <5049952A.3010000@denx.de> Message-ID: <1347320357.2967.17.camel@linux-davidd> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de Hi Stefan, Thank you for your quick and thorough reply! On Fri, 2012-09-07 at 08:33 +0200, Stefan Roese wrote: > Hi David, > > 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. > > Welcome. :) > Thanks! :-) > > 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 [1] and [2]). 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. Agreed it would be a nightmare to keep the MIPS repo in sync with the denx.de mainline. And relieved to e-hear that there is no strict 256KiB image size rule. So yes, I plan to contribute all the "deluxe" features (as build time options) to denx.de's git repo. Thanks for helping me keep it simple... > Best regards, > Stefan > > [1] http://www.denx.de/wiki/U-Boot/CodingStyle > [2] http://www.denx.de/wiki/view/U-Boot/Patches > > -- > DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel > HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany > Phone: (+49)-8142-66989-0 Fax: (+49)-8142-66989-80 Email: office at denx.de