Date: Mon, 3 Sep 2018 18:43:03 -0700 From: Mark Millard <marklmi@yahoo.com> To: freebsd-arm <freebsd-arm@freebsd.org> Subject: FYI: What a fairly-modern linux's /sys/kernel/debug/mmc0/ios reports on a Pine64+ 2GB for a Sandisk Ultra 128GB Micro SDXC UHS-I Card from a SDSQUAR-128G-GN6MA Message-ID: <52D448D7-C112-4C23-932C-16A5362E6844@yahoo.com>
next in thread | raw e-mail | index | archive | help
[The Pine64+ 2GB focus is just because that is all I currently have access to for aarch64. I have no access to armv7 or such currently. The amd64 context is via virtualbox under macOS and so not relevant.] I finally have access to similar capacity microsdxc media to the previous e.MMC-on-adapter media that I had been using with the Pine64+ 2GB. The card tested for this is from a: Sandisk Ultra 128GB Micro SDXC UHS-I Card with Adapter = SDSQUAR-128G-GN6MA So I dd'd the fairly linux that I tested the e.MMC with over to the microsdxc. The linux is from: https://dl.armbian.com/pine64/Ubuntu_bionic_dev_nightly.7z which is: nightly mainline kernel master branch 4.17.y or 4.18.y It shows as: # uname -ap Linux pine64 4.18.0-rc4-sunxi64 #220 SMP Sun Jul 15 14:16:31 UTC 2018 = aarch64 aarch64 aarch64 GNU/Linux For the sdcard from the SDSQXBG-128G-GN6MA: # cat /sys/kernel/debug/mmc0/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) # hdparm -t /dev/mmcblk0 /dev/mmcblk0: Timing buffered disk reads: 70 MB in 3.07 seconds =3D 22.80 MB/sec (As I gather: all as expected.) For reference the e.MMC on an adapter used in the Pine64+ 2GB for this linux had shown: # cat /sys/kernel/debug/mmc0/ios clock: 52000000 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: 8 (mmc DDR52) signal voltage: 0 (3.30 V) driver type: 0 (driver type B) # hdparm -t /dev/mmcblk0 /dev/mmcblk0: Timing buffered disk reads: 134 MB in 3.04 seconds =3D 44.03 MB/sec (As I gather: this was surprising.) =3D=3D=3D Mark Millard marklmi at yahoo.com ( dsl-only.net went away in early 2018-Mar)
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?52D448D7-C112-4C23-932C-16A5362E6844>