Hi,
I was looking for some way to decrease the flashing time with Flashrom
for a 2MB SST SST25VF016B chip with a Dediprog SF100 programmer. After
taking a look at the datasheet, stefanct suggested to try to change the
write function for SST25VF016B to spi_aai_write, instead of
spi_chip_write_1.
(I had tried changing it to spi_chip_write_256 some time ago.
Unsurprisingly, the results were not so good)
I did some benchmark by writing random data on a chip already filled
with random data. I attached the results. I've run the benchmark two
times and got similar results on the two runs.
In short:
- with spi_aai_write, writing takes 56 minutes and seems to work reliably
- with spi_chip_write_1, writing takes 143 minutes
I also ran the test with -VV but the log is so big I can't possibly
send it to the mailing list. Here it is:
http://neetwork.net/up/misc/bench_vv
I also attached the patch I applied to Flashrom's trunk.
--
Noé Rubinstein
Proformatique (groupe Avencall) - XiVO IPBX OpenHardware
10 bis, rue Lucien VOILIN - 92800 Puteaux
======== With AAI =========
flashrom v0.9.3-r1373 on Linux 2.6.32-5-686 (i686), built with libpci 3.1.7,
GCC 4.4.5, little endian
flashrom is free software, get the source code at http://www.flashrom.org
Calibrating delay loop... OK.
Found chip "SST SST25VF016B" (2048 kB, SPI) on dediprog.
Erasing and writing flash chip... Done.
Verifying flash... VERIFIED.
real 56m15.371s
user 0m25.690s
sys 0m0.196s
======= Without AAI =======
flashrom v0.9.3-r1335 on Linux 2.6.32-5-686 (i686), built with libpci 3.1.7,
GCC 4.4.5, little endian
flashrom is free software, get the source code at http://www.flashrom.org
Calibrating delay loop... OK.
Found chip "SST SST25VF016B" (2048 kB, SPI) on dediprog.
Erasing and writing flash chip... Done.
Verifying flash... VERIFIED.
real 143m56.173s
user 0m14.141s
sys 0m45.459s
======= Reading test ======
flashrom v0.9.3-r1335 on Linux 2.6.32-5-686 (i686), built with libpci 3.1.7,
GCC 4.4.5, little endian
flashrom is free software, get the source code at http://www.flashrom.org
Calibrating delay loop... OK.
Found chip "SST SST25VF016B" (2048 kB, SPI) on dediprog.
Reading flash... done.
real 0m6.186s
user 0m1.100s
sys 0m0.000s
Index: flashchips.c
===================================================================
--- flashchips.c (revision 1373)
+++ flashchips.c (working copy)
@@ -5369,7 +5369,7 @@
},
},
.unlock = spi_disable_blockprotect,
- .write = spi_chip_write_1,
+ .write = spi_aai_write,
.read = spi_chip_read,
.voltage = {2700, 3600},
},
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