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

[Jens Gehrlein <sew_s@tqs.de>]

Dear Jean-Christophe,

Jean-Christophe PLAGNIOL-VILLARD schrieb:
> On 17:46 Tue 16 Dec     , Jens Gehrlein wrote:
>> Jean-Christophe PLAGNIOL-VILLARD schrieb:
>>> On 17:25 Tue 16 Dec     , Jens Gehrlein wrote:
>>>> Hi list,
>>>>
>>>> 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?
>>> Could you try it against the qemu SVN HEAD
>> ??? Sorry, what is qemu SVN HEAD ???
>>
> In qemu you have 2 boards emulated with u-boot support qemu_mips and SX1

Now, I understand, what you meant.

> 
> it'll be nice to test them also
> 
> please note they are only in the SVN tree of qemu

Because I'm neither familiar with qemu nor with svn I can't do that
with little effort (installation, familiarization, etc.). Beside that,
how could a virtual machine simulate the real bus access with it's
bus timing? If I'm right in this point, only testing on another
architecture is possible, but no performance test.

Shortly, I will get a TQM8548 with Samsung Flash. It's a top boot
system, but also has a 2x16 Bit Flash connection. For my part, I can
only offer you a test on this board.

Stefan, as the CFI custodian, how is your procedure to check such kind
of common code patches?

Kind regards,
Jens