CFI: increase performance
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Cover letter [U-Boot] [PATCH 0/2] CFI: increase performance
Quoted 33 lines · Jens Gehrlein
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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?
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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_mipsand SX1Now, I understand, what you meant.
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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.
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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?
First a review of course. And second tests on multiple boards. It would be good if you could test your patch on a few other systems as well. If nobody objects, I'll apply your patch to the cfi/next branch in a few days and will probably test it on some of my boards too. It will hit mainline in the next merge window then.
Best regards,
Stefan
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