On 2/19/25 3:21 PM, Emil Renner Berthing wrote:
Maud Spierings via B4 Relay wrote:
From: Maud Spierings <maud_spierings@xxxxxxxxxxx>
The assigned clock speed of 50 MHz is and max-frequency of 100MHz are
limitting this interface which is SDIO 5.0 capable. Sadly at 200MHz it
fails to mount an eMMC drive, 150MHz (really 132 MHz) is the highest it
was able to get.
This improves the seq read/write performance by 2x~
Signed-off-by: Maud Spierings <maud_spierings@xxxxxxxxxxx>
---
I put this in this specific dts instead of the common one as I cannot
test if other boards are also able to handle these speeds.
Hi Maud,
Thanks for the patch!
These settings work on my Milk-V Mars board booting off eMMC, but I'm not sure
if that means we can just raise the frequency across all the JH7110 boards.
The eMMC on my Milk-V mars is a detachable module that identifies as
mmcblk0: mmc0:0001 DG4016 14.7 GiB
I guess what works might depend on the module too. Is the eMMC on the framework
board soldered on?
No it is also a detachable module, it supports the same interface as
most eMMC modules seem to.
Raising the max-frequency to 200MHz seems right for all boards since we're
already saying mmc0 supports HS200 mode.
Maybe we could begin by raising the max frequency to 200MHz for all boards,
but only assign the 150MHz rate on the framework board?
That seems alright with me, I'll send a v2 with max-frequency adjusted
in jh7110-common instead.
/Emil
kind regards,
Maud
