> > What throughput rates do you get on a mx28-regulated slot serving a card > > at 50Mhz? This is poor here (55kb/s) while it is OK at 25Mhz. Could be a > > To make sure we are on the same test, can you share the test case > you ran to get the result? So that I can run it here for the result > on my board.
# mount -t vfat /dev/mmcblk0p1 /mnt # dd if=/mnt/test.dat of=/tmp/a bs=1024 # umount /mnt # ./dd --version dd (coreutils) 8.5 ... 'test.dat' was a 8MB file of random data on a 4GB SDHC card (extrememory) on a slot powered by the mx28. Operating the card at 50Mhz, dd will report ~55 kb/s. If I add 'rate /= 2;' to the beginning of set_clk_rate, so it will operate at 25Mhz, I have 8mb/s. Regards, Wolfram -- Pengutronix e.K. | Wolfram Sang | Industrial Linux Solutions | http://www.pengutronix.de/ |
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