Date: Thu, 25 May 2006 16:37:46 -1000 From: Jim Thompson <jim@netgate.com> To: Ben Kelly <bkelly@vadev.org> Cc: Poul-Henning Kamp <phk@phk.freebsd.dk>, freebsd-current@freebsd.org, small@freebsd.org Subject: Re: FreeBSD's embedded agenda Message-ID: <9453AA8E-B50B-4BF4-91F2-1AC5538FC6E6@netgate.com> In-Reply-To: <200605251628.58158.bkelly@vadev.org> References: <3500.1148571492@critter.freebsd.dk> <200605251628.58158.bkelly@vadev.org>
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On May 25, 2006, at 10:28 AM, Ben Kelly wrote: > On Thursday 25 May 2006 11:38 am, Poul-Henning Kamp wrote: >> Writing a flash-friendly-filesystem would be a good project. > > Would it be reasonable to try porting JFFS2 or are their reasons to > write > something from scratch? some people have concerns about the performance of JFFS2 on large flash devices (> 16MB). Frankly, if supporting large flash devices (or arrays) is an issue, then perhaps the wear-leveling intermediate layer with a standard filesystem on top is a better approach. The real issue with porting JFFS2 is that its covered by the GPL, and putting GPL code in the FreeBSD kernel is typically considered a 'no- no'. Still, the embedded linux folks get a >TON< of milage out of MTD+JFFS2. Nobody has brought up supporting non-Freesbie bootloaders, either. Many boards use redboot, u-boot or one of the MIPS loaders to get going. Getting these to boot FreeBSD will also be part of any solution. I don't think its practical to port Freesbie to any new board, not in the short-to-medium timeframe, either. Jim
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