[U-Boot] JFFS2 with NAND flash is very SLOW ...

From: Pierre Savary <pierre.savary@kerlink.fr>
To: u-boot@lists.denx.de
Subject: [U-Boot] JFFS2 with NAND flash is very SLOW ...
Date: Tue, 2 Jun 2009 14:51:16 +0200	[thread overview]
Message-ID: <00c501c9e380$d2b2ebf0$7818c3d0$@savary@kerlink.fr> (raw)
In-Reply-To: <579B119545DAEF4689C8FBEEFEC5793F01D4FEDA3A92@ATLMBX.verint.corp.verintsystems.com>

In my side:
MTD0 (720kB): U-boot
MTD1 (80kB) : env. Variables
MTD2 (12MB) : kernel + initramfs
MTD3 (50MB) : rootfs

If it exists a difference between 2009.03 and 1.3.3 it is not sufficient. It
is very slow in both versions. It takes more than 1 minutes to obtain the
result of "fsinfo" command !!!

Thanks for your help,

Pierre

-----Message d'origine-----
De?: u-boot-bounces at lists.denx.de [mailto:u-boot-bounces at lists.denx.de] De
la part de Cote, Sylvain
Envoy??: mardi 2 juin 2009 14:22
??: Pierre Savary; u-boot-users at lists.sourceforge.net; u-boot at lists.denx.de
Objet?: Re: [U-Boot] JFFS2 with NAND flash is very SLOW ...

Dear Pierre,

> It works... but I have a very big problem : it's very very slow!!!! How
can
> I decrease the time to load the kernel image?
> I try with u-boot 1.3.3, 1.3.4 and 2009.03 but the problem is always
> present...

I have tried to boot from nand with 1.3.4 and 2009.03.  I can tell you that
2009.03 is much faster then 1.3.4 to boot from a formatted JFFS2 nand.

> Can you help me please?

What is the size of the partition used to store the kernel? I suggest to use
a small partition to store the kernel (5M by exemple something like 10M if
you have an initramfs).  You should have something like this:

MTD1 u-boot 2M
MTD2 kernel 5M
MTD3 content remainingM

Sylvain Cote

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