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

[Pierre Savary]

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
Envoyé : mardi 2 juin 2009 15:32
À : 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

=====================================================================
DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: +49-8142-66989-0 Fax: +49-8142-66989-80  Email: office at denx.de
=====================================================================
_______________________________________________
U-Boot mailing list
U-Boot at lists.denx.de
http://lists.denx.de/mailman/listinfo/u-boot