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?
Thanks, Jens
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Jens Gehrlein (2): CFI: increase performance of function find_sector() CFI: avoid redundant function call in single word programming mode
drivers/mtd/cfi_flash.c | 33 +++++++++++++++++++++++---------- 1 files changed, 23 insertions(+), 10 deletions(-)