Date: Thu, 25 May 2006 13:56:17 -0400 From: "Andrew Atrens" <atrens@nortel.com> To: Poul-Henning Kamp <phk@phk.freebsd.dk> Cc: Alexander Leidinger <Alexander@Leidinger.net>, Jim Thompson <jim@netgate.com>, small@freebsd.org, current@freebsd.org Subject: Re: FreeBSD's embedded agenda Message-ID: <4475EFC1.1020504@nortel.com> In-Reply-To: <3981.1148578569@critter.freebsd.dk> References: <3981.1148578569@critter.freebsd.dk>
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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Poul-Henning Kamp wrote: > In message <4475E99C.5000502@nortel.com>, "Andrew Atrens" writes: > >>-----BEGIN PGP SIGNED MESSAGE----- >>Hash: SHA1 >> >>Seems to me you'd want a kernel that could boot off raw >>flash and run in RAM off a small RAM disk. >> >>Said kernel would have a low level driver that makes plain >>old flash chips look (and behave) like a disk. It would support >>wear-levelling, [...] >> >>Then you could throw FFS on top of that. > > > This is exactly what you do not want to do. > > You want to write a flash friendly filesystem which knows what > a flash is, and which does the wear levelling internally. > > The reason Flash Adaptation Layers came about in the first place > is that W95 didn't support anything but FAT. Hmm. I was thinking about partitioning the problem actually. Make flash look like a disk and then you can put any filesystem on it that you want. Seems a heck of a lot simpler .. and I'm not sure if I see any drawbacks to doing it that way ... Having said that, it would be great if we had a solid log-structured filesystem for *BSD. Andrew. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.2 (FreeBSD) Comment: Using GnuPG with Thunderbird - http://enigmail.mozdev.org iD8DBQFEde/B8It2CaCdeMwRAjQUAJ90eJNuU2aJW8UogdMPSC3RTfBwqwCfWdvB lKUuNnxUbyP6LM5vKrdLs2o= =E72s -----END PGP SIGNATURE-----
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