CFI: increase performance

Dear Jean-Christophe,

Quoted 16 lines · Jean-Christophe PLAGNIOL-VILLARD

Quoted 15 lines · Jens Gehrlein

Quoted 14 lines · Jean-Christophe PLAGNIOL-VILLARD

Quoted 13 lines · Jens Gehrlein

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).

Quoted 7 lines

Quoted 6 lines

Quoted 4 lines

Quoted 3 lines

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.

Quoted 3 lines

it'll be nice to test them also

Quoted 1 line

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.