From: Tolunay Orkun <listmember@orkun•us>
To: Wolfgang Denk <wd@denx•de>
Cc: White <white@from-b•org>, linuxppc-embedded@ozlabs•org
Subject: Re: Upgrading cramfs root file system while running (DENX wrote that is not possible)
Date: Sat, 22 Apr 2006 13:50:26 -0500 [thread overview]
Message-ID: <444A7AF2.5010605@orkun.us> (raw)
In-Reply-To: <20060421165548.A03E53526B7@atlas.denx.de>
Wolfgang Denk wrote:
> In message <44485B3F.8080308@orkun•us> you wrote:
>
>> If your bootloader is U-Boot and you are using standard bootm command to
>> boot, U-Boot decompresses the initrd image to RAM before passing the
>> file system to Linux. So, you are not working with flash copy and
>> updating the flash copy is not a problem at all. This applies to ext2,
>> cramfs or squashfs based initrd.
>>
>
> But it makes no sense to use cramfs or squashfs on a ramdisk.
> You *want* to run these directly from flash.
> But then, of course, you need alternate images (or other tricks)
> for full image updates.
>
Well, we lose a couple of MB of RAM but squashfs as initrd has been
reliable, very compact and since the file system is in RAM, it is faster
and we can tune a bit for smaller cache etc.
Image updates have been extremely easy as a result, we did not need to
resort to alternate images and other tricks as a result. If you have
more flexibility in RAM than in flash, our approach makes sense without
complicating the matter much. I understand that not everyone might have
this option.
> [Single file updates can be done using overlay file systems; see the
> DULG for details.]
I know about the overlay fs. There is also unionfs that works similarly.
Best regards,
Tolunay
next prev parent reply other threads:[~2006-04-22 18:50 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-04-06 20:38 Upgrading cramfs root file system Antonio Di Bacco
2006-04-19 7:42 ` Wojciech Kromer
2006-04-20 19:54 ` Antonio Di Bacco
2006-04-20 20:18 ` White
2006-04-20 21:03 ` Upgrading cramfs root file system while running (DENX wrote that is not possible) Antonio Di Bacco
2006-04-20 21:08 ` Antonio Di Bacco
2006-04-21 4:10 ` Tolunay Orkun
2006-04-21 5:51 ` antonio.dibacco
2006-04-21 16:57 ` Wolfgang Denk
2006-04-22 19:07 ` Tolunay Orkun
2006-04-21 16:55 ` Wolfgang Denk
2006-04-22 18:50 ` Tolunay Orkun [this message]
2006-04-21 6:53 ` David Jander
2006-04-21 20:23 ` Wolfgang Denk
2006-04-21 21:32 ` Antonio Di Bacco
2006-04-22 11:40 ` Stefan Eletzhofer
2006-04-22 19:21 ` Upgrading cramfs root file system while running (DENX wrote that is not possible)I Antonio Di Bacco
2006-04-22 19:53 ` Upgrading cramfs root file system while running (DENX wrote that is not possible) Tolunay Orkun
[not found] ` <20060420211120.GA3546@mail.gnudd.com>
2006-04-20 21:37 ` Antonio Di Bacco
2006-04-21 6:42 ` Upgrading cramfs root file system Wojciech Kromer
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