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Compatible eMMC modules and benchmarks
#1
Question 
I ordered my rock64 a few days ago but I'm not expecting it to arrive for a few weeks yet as I live in the UK.

I ordered a 32GB eMMC from a UK electronics company but I got sent a chip, not a module that would work with the rock64 so I'm having to return it. They had no pictures of it on their site so I didn't know what it was until it arrived.

I've read on this forum that the rock64 is compatible with odroid emmc modules but which odroid model is the rock64 (most) compatible with? odroid.co.uk sells emmc modules for the odroid C1/C1+, C2 or XU3/XU4. I'm not sure if these modules all have different connectors or if its just different software pre-loaded onto them?

Is there anywhere else is the UK or Europe apart from odroid.co.uk and allo that sells emmc modules? Is there a best brand or model to look for? Has anyone done any benchmarks of different emmc modules with the rock64? Tell me everything I might need to know about emmcs and the rock64 please, the rock64/pine64 page doesn't tell us much about this.
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#2
(07-12-2018, 11:37 AM)danboid Wrote: I ordered my rock64 a few days ago but I'm not expecting it to arrive for a few weeks yet as I live in the UK.

I ordered a 32GB eMMC from a UK electronics company but I got sent a chip, not a module that would work with the rock64 so I'm having to return it. They had no pictures of it on their site so I didn't know what it was until it arrived.

I've read on this forum that the rock64 is compatible with odroid emmc modules but which odroid model is the rock64 (most) compatible with? odroid.co.uk sells emmc modules for the odroid C1/C1+, C2 or XU3/XU4. I'm not sure if these modules all have different connectors or if its just different software pre-loaded onto them?

Is there anywhere else is the UK or Europe apart from odroid.co.uk and allo that sells emmc modules? Is there a best brand or model to look for? Has anyone done any benchmarks of different emmc modules with the rock64? Tell me everything I might need to know about emmcs and the rock64 please, the rock64/pine64 page doesn't tell us much about this.

There is no universal standard for eMMC sockets - just so you know.
Yes, sure, some odroid eMMC modules are compatible and will work (I have one for the C2 that works just fine) with the PINE64 boards; including the Rock64. I will not speculate on here which of the odroid modules will and which will not work because I do not wish to give you a false impression that compatibility is guaranteed.
As for the benchmarks, they are out there if you google ... in short, Ordoid's high prices reflect higher performance.
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#3
I use odroid.co.uk and get the "32GB eMMC Module C2 Linux "
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#4
(07-13-2018, 10:47 AM)digitaldaz Wrote: I use odroid.co.uk and get the "32GB eMMC Module C2 Linux "

I tested around with a few of hardkernel's eMMC modules in my Rock64.  The board recognized them and was able to read/write to them but I got some errors at some points using the sd2emmc installers to attempt to install a linux distro to the eMMC modules.

I did a bit of a write-up on it over here:

https://archlinuxarm.org/forum/viewtopic...67&t=12706

I haven't really looked into too much what was going on though, but summers over on the Arch Linux ARM forums presented the idea to boot from the sd card with the eMMC module installed and then we would be able to test out the eMMC module from a running system by mounting it and seeing what types of errors occurred, if any.

I will say that it may be dangerous to attempt to 'hot plug' an eMMC module and wouldn't recommend it.  I managed to brick an Odroid XU4 by hot-plugging an eMMC module as something in the board got damaged as a result and after performing it I was never again able to get the board to power on or make any attempt to boot.
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#5
just as fyi I went ahead and took a look at the pin-outs and compared the odroid-xu4, odroid-c2 and rock64 emmc connectors

They appear mostly the same with the exception of two pins.

In the rock64 pins 15 and 13 are tied directly to GND.

In the Odroid-C2 and Odroid-XU4 pin 15 is tied to a signal called RCLK and pin 13 is tied to a signal called CDN. The RCLK goes to a pin named for RDQS. The CDN pin lands different places for the C2 or XU4. In the XU4 it goes to the main chip and appears to be used for something with controlling the eMMC module and the C2 it lands someplace else.

Other than these 2x pins the rest of the pin-out is the same, I'm not sure how important these two signals are or what they're used for in operating the eMMC module. If the hardkernel modules can be used without them in the Rock64 I don't know.

I also checked the libre computer renegade (ROC-3328-CC) eMMC module pin-out, which varies significantly from what is found on hardkernel's odroids and what I saw on the rock64 for the pin-arrangement.

Just thought I'd put this for reference as there is a hardware difference that hardkernel is using with their eMMC modules that is not being used by rock64 and whether hardkernel's eMMC modules can operate successfully in a rock64 without these functions being used is something I do not know.
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