[U-Boot] boot-up time optimization. Where to start?

[Stefano Babic <sbabic@denx.de>]

On 05/03/2011 08:48 AM, Alexander Stein wrote:

Hi Alexander,

> Am Montag, 2. Mai 2011, 19:00:47 schrieb Wolfgang Denk:
>> In message <201105021640.27241.alexander.stein@systec-electronic.com> you 
> wrote:
>>> Ok, let me be more precise on this.
>>> We used U-Boot v2010.09 on a custom board running on an I.MX35 (ARM1136).

The i.MX35 is supported in u-boot mainline. As I can suppose, you start
from the mx35pdk to port your code, probably you have good chances to
use the last u-boot code. And then to send patches for your board,
too... ;-)

> 
>> 2. This is an ARM board.
>>
>> 3. This is an old version before cache support for ARM was added.
> 
> This specific version was selected due to relocation problems on ARM.

The mx35pdk board is supported in u-boot mainline using relocation.

> expect the dcache doesn't have that big influence on the named code part as 
> the environment is already in RAM.

Check in the mailing list, the numbers reported by people who measured
the influence of cache say there is a big difference, specially when big
chunks of code is copied, that is copying the kernel from storage before
booting.

Best regards,
Stefano Babic

-- 
=====================================================================
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
=====================================================================