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

[Pierre Savary <pierre.savary@kerlink.fr>]

In fact it is not better with this config:
#define CONFIG_ICACHE_ON
#define CONFIG_DCACHE_ON
#define CONFIG_SYS_DCACHE_SIZE          32768
#define CONFIG_SYS_ICACHE_SIZE          32768
#define CONFIG_SYS_CACHELINE_SIZE       32

My architecture is arm926ejs and it seems that CACHE management is not
implemented...

I just measure a load of uImage (2MB) ... it takes more than 2 minutes :-(

Pierre


-----Message d'origine-----
De?: u-boot-bounces at lists.denx.de [mailto:u-boot-bounces at lists.denx.de] De
la part de Stefan Roese
Envoy??: mardi 2 juin 2009 15:32
??: u-boot at lists.denx.de
Cc?: Pierre Savary; 'Cote, Sylvain'
Objet?: Re: [U-Boot] JFFS2 with NAND flash is very SLOW ...

On Tuesday 02 June 2009 15:23:57 Pierre Savary wrote:
> Is it better to use or not D-cache and I-cache?

Depends a bit on the "application". From my experience I-Cache is most 
important. But for memory intensive applications (JFFS2 might be such a
beast) 
D-cache could be very helpful as well. Best is to have both enabled of
course.

> Currently, in my config file, I have only
> #define CONFIG_CMD_CACHE
> What do I have to add?

Defining the cache commands doesn't insure that caches are really enabled. 
Some platforms don't support I- and/or D-cache in U-Boot. I can only speak
for 
PPC4xx which has I-cache enabled and "usually" D-cache disabled (because of 
cache-coherency issues). This might be different on your platform. Again,
just 
enabling the cache commands will most likely not help here.

Best regards,
Stefan

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