Mike, although I have not made any measurements I have noticed in the last few days (coincidentally I have been doing a lot of work with a ZCU102) that the SD interface seemed a bit slow. Are you seeing this on Zynq 7K or US+ MPSoC? Best Regards Peter
On Thu, 21 Mar 2019 at 16:38, Mike Looijmans <mike.looijm...@topic.nl> wrote: > The SD and eMMC controller has become terribly slow in 2018.3: > > # echo 3 > /proc/sys/vm/drop_caches > > # dd if=/dev/mmcblk0 of=/dev/null bs=1M count=20 > 20+0 records in > 20+0 records out > 20971520 bytes (20.0MB) copied, 4.972666 seconds, 4.0MB/s > > # dd if=/dev/mmcblk1 of=/dev/null bs=1M count=20 > 20+0 records in > 20+0 records out > 20971520 bytes (20.0MB) copied, 38.899436 seconds, 526.5KB/s > > > This used to be over 160MB/s for the eMMC (mmcblk0) and over 20 MB/s for > the > SD card (mmcblk0) with the 2018.1 kernel and bootloader. > > This is only in Linux, the bootloader still reads at about 10MB/s from the > SD > card. So apparently the clocks are set up okay. > > According to the kernel, the clocks and interface are running at full > speed: > > # cat /sys/kernel/debug/mmc0/ios > clock: 200000000 Hz > actual clock: 200000000 Hz > vdd: 21 (3.3 ~ 3.4 V) > bus mode: 2 (push-pull) > chip select: 0 (don't care) > power mode: 2 (on) > bus width: 3 (8 bits) > timing spec: 9 (mmc HS200) > signal voltage: 1 (1.80 V) > driver type: 0 (driver type B) > > # cat /sys/kernel/debug/mmc1/ios > clock: 50000000 Hz > actual clock: 50000000 Hz > vdd: 21 (3.3 ~ 3.4 V) > bus mode: 2 (push-pull) > chip select: 0 (don't care) > power mode: 2 (on) > bus width: 2 (4 bits) > timing spec: 2 (sd high-speed) > signal voltage: 0 (3.30 V) > driver type: 0 (driver type B) > > > Any insights? > -- > _______________________________________________ > meta-xilinx mailing list > meta-xilinx@yoctoproject.org > https://lists.yoctoproject.org/listinfo/meta-xilinx >
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