Enable HS400 in Foresee eMMC?

#1

Hi,

First of all congratulations to the Radxa team for this awesome little board.

I have a 4GB/32GB Zero with the Radxa Debian installed.

I’m using it as a daily driver for programming and browsing and it works perfectly… A less than 5 watt fully working PC! :open_mouth:

I see in the emmc docs that it can reach a max read speed of 200MB/s. Testing the read speed with hdparm only reaches 131MB/s.

The Foresee 32GB emmc supports HS400 but it seems that it is not enabled by Debian.

Here is what I found in dmesg:

…

rock@radxa-zero:~$ dmesg | grep mmc
[    3.141608] meson-gx-mmc ffe05000.sd: Got CD GPIO
[    3.461728] meson-gx-mmc ffe03000.sd: allocated mmc-pwrseq
[    3.476567] meson-gx-mmc ffe07000.mmc: allocated mmc-pwrseq
[    3.542928] mmc2: queuing unknown CIS tuple 0x80 (2 bytes)
[    3.545073] mmc2: queuing unknown CIS tuple 0x80 (3 bytes)
[    3.551489] mmc2: queuing unknown CIS tuple 0x80 (3 bytes)
[    3.558599] mmc2: queuing unknown CIS tuple 0x80 (7 bytes)
[    3.565868] mmc2: queuing unknown CIS tuple 0x81 (9 bytes)
[    3.639199] mmc2: new ultra high speed SDR50 SDIO card at address 0001
[    3.642926] mmc0: new **HS200 MMC** card at address 0001
[    3.652493] mmcblk0: mmc0:0001 SLD32G 28.9 GiB 
[    3.656531] mmcblk0boot0: mmc0:0001 SLD32G partition 1 4.00 MiB
[    3.662371] mmcblk0boot1: mmc0:0001 SLD32G partition 2 4.00 MiB
[    3.667986] mmcblk0rpmb: mmc0:0001 SLD32G partition 3 4.00 MiB, chardev (242:0)
[    3.702215]  mmcblk0: p1 p2
[    4.006031] EXT4-fs (mmcblk0p2): mounted filesystem with ordered data mode. Opts: (null)
[    4.908317] EXT4-fs (mmcblk0p2): re-mounted. Opts: discard
[    6.529007] brcmfmac mmc2:0001:1: Direct firmware load for brcm/brcmfmac43456-sdio.radxa,zero.txt failed with error -2

…

Is HS400 really disabled? If it is so, what should I do to enable HS400?

Thank you! :slightly_smiling_face:

#2

Foresee’s eMMC was known to have issue with HS400. We have sent some samples to a Manjaro developer who is working on fixing this issue.

5A corrupts eMMC (was 5A does not boot)
#3

Hi RadxaYuntian,

Any news on this issue?

Is it possible to enable HS400 on the Foresee eMMC?

Thanks! :slightly_smiling_face:

#4

@spikerguy What did you guys learned about those Foresee eMMC we sent to you?

#5

Hi,

As one can read in the Foresee SLG32D eMMC datasheet (see below), enabling HS400 would effectively double the max speed of our Zero eMMC, from (near) 200MB/s to (near) 400MB/s.

This is a dramatic speed up for this tiny but amazing board.

I think it is well worth looking into.

Is there any Linux hacker out there that knows how to set the eMMC to HS400?

You can find a link to the datasheet below.

Thanx! :slightly_smiling_face:

#6

Hi,

Anyone was able to enable HS400?

Thanx!