[U-Boot] [PATCH 0/2] CFI: increase performance

[Stefan Roese <sr@denx.de>]

Hi Jens,

On Monday 26 January 2009, Jens Gehrlein wrote:
> >> The following patches should increase the performance of the CFI driver,
> >> particularly with regard to single word programming mode.
> >>
> >> I tested it on TQM5200S with NOR-Flash Samsung K8P2815UQB, which has no
> >> write buffer. At least no write buffer, that could be programmed using
> >> standard commands.
> >>
> >> Performance increase on this TQM is about factor 2.6 (37 KiB/s -> 95
> >> KiB/s). On the same module with Spansion S29GL128N (with write buffer)
> >> it is about factor 1.2 (455 KiB/s -> 585 KiB/s).
> >>
> >> TQM5200 is a bottom boot module with 2x16 Bit Flash connection. Could
> >> someone test the patches on other HW, particularly top boot, other CPU,
> >> other flash width, please?
> >
> > Tested on AMCC Kilauea (PPC405EX, with 1*16bit Spansion S29GL512N.
>
> The S29GL512N has a write buffer, AFAIK. Thus, U-Boot chooses another
> programming algorithm. Possibly, you only tested patch 2 or did you
> override buffered programming for your test so that patch 1 was
> included?

No, I tested both your patches with the unchanged kilauea config to see if you 
patch broke this (standard) configuration. Nothing bad happened so I applied 
it to the master branch. Others will surely test it as well when its 
available in mainline.

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
=====================================================================