Gentoo Archives: gentoo-embedded

From: stephane ancelot <sancelot@××××.fr>
To: gentoo-embedded@l.g.o, solar@g.o
Cc: Daniel Frickemeier <Daniel@×××××××.de>, gentoo-embedded@l.g.o
Subject: Re: [gentoo-embedded] Creating a gentoo based system for embedded
Date: Fri, 08 Oct 2004 07:00:05
Message-Id: 200410080904.09082.sancelot@free.fr
In Reply to: Re: [gentoo-embedded] Creating a gentoo based system for embedded by Ned Ludd
1 Hi,
2 A few notes about compact flash, I recently made a research about cflash
3 products.
4 The main safety in compact flash products is in the availability of the wear
5 leveling function (secure mode)
6 low cost cflash do not include this capability , for this reason , you will
7 need to use jffs2 , to allow sector repartition over the disk.
8
9 However more robust products (sandisk / lexar) include the wear leveling
10 function in the card and it is completely transparent from the user, you use
11 it as a single normal ide disk.
12 Furthermore, lifetime and throuput bandwidth of these products is faster than
13 common camera cflash.
14
15 If interested in I could give you more details on how to check if your cflash
16 card supports wear leveling .
17 Best Regards
18 Steph
19
20
21 >
22 > One solution here for him could be to use squashfs + jffs2.
23 > I wont explain how to do that. But it's probably worth his time to
24 > research it. The openwrt project is making use of this type of setup now
25 > to make failsafe systems that live on flash. http://openwrt.org
26 >
27 > > > Furthermore , the system may stay in a readonly partition , but we have
28 > > > to plug our application in this system that should be setted up on a
29 > > > separate partition because we should be able to send updates for it .
30 > > > and the user may load save files on it .
31 > > >
32 > > > What are the gentoo tools to allow that ?
33 >
34 > sys-fs/squashfs-tools-2.0_p2
35 > sys-fs/mtd-20040825
36 >
37
38 --
39 gentoo-embedded@g.o mailing list

Replies

Subject Author
Re: [gentoo-embedded] Creating a gentoo based system for embedded Heath Holcomb <hholcomb@×××××××××.com>