[U-Boot] JFFS2 with NAND flash is very SLOW ...
Pierre Savary
pierre.savary at kerlink.fr
Tue Jun 2 17:30:08 CEST 2009
Which source code? I use the 2009.03 version without modification.
This is my config file:
[...]
#define CONFIG_CMD_NAND
#define CONFIG_SYS_MAX_FLASH_BANKS 1
#define CONFIG_SYS_MAX_NAND_DEVICE 1
#define CONFIG_SYS_NAND_BASE 0x20020000
#define NAND_MAX_CHIPS 1
#define CONFIG_ENV_IS_IN_NAND
[...]
#define CONFIG_CMD_JFFS2
[...]
#define CONFIG_JFFS2_NAND
#undef CONFIG_JFFS2_CMDLINE
#define CONFIG_JFFS2_DEV "nand0"
#define CONFIG_JFFS2_PART_SIZE 0x00C00000
#define CONFIG_JFFS2_PART_OFFSET 0x000C8000
[...]
#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
[...]
And in fact it is better with I-Cache enabled. I carried out more precise
measurements and I obtain: 1min45 without I-cache and 40sec with I-cache. It
is better but not enough...
Thanks for your help.
Best Regards,
Pierre
-----Message d'origine-----
De : u-boot-bounces at lists.denx.de [mailto:u-boot-bounces at lists.denx.de] De
la part de Jean-Christophe PLAGNIOL-VILLARD
Envoyé : mardi 2 juin 2009 17:06
À : Stefan Roese
Cc : Pierre Savary; 'Cote, Sylvain'; u-boot at lists.denx.de
Objet : Re: [U-Boot] JFFS2 with NAND flash is very SLOW ...
On 15:59 Tue 02 Jun , Stefan Roese wrote:
> On Tuesday 02 June 2009 15:56:25 Pierre Savary wrote:
> > 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
:-(
>
> Yes, this is really slow. Jean-Christophe will be able to tell us if
caches
> are supported on this platform in U-Boot.
I've not yet find time to implement the MMU support for arm (needed for
D-Cache support), I've plan to add it for the next release (not for this
next
merge window)
I-Cache is supported
but 2 mins is really slow, could show us your code?
Best Regards,
J.
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