Radxa Cubie A7A/A7Z - Allwinner a733

[humanus]

@alexc @qq20739111 I would be very surprised if the UART log showed anything other than mine. You can find it attached above.

[alexc]

@humanus Thanks, just noticed the log.

Interestingly looks like it's the mmc part. A few things I can think of:

1. emmc is only presented on A7A/S, so if you are using emmc or your board has an emmc, it might be a problem. You can try to disable sdc2 on device tree and see if it works.

1. sd card part is the same on A7A/S/Z, but I don't think my card is a UHS-II card. Looking at the log, it might be doing something with UHS-II, so it might be worth trying a different SD card to see if it behaves differently. If it does turn out to be related to UHS-II handling, I can look into a proper fix later. on.

[humanus]

I have no eMMC and the card isn't UHS-II (I use WD Purple cards, they are UHS-I). I don't think I have any UHS-II cards at the moment... Could try a different one though.

Edited 21 hours ago by humanus
clarify

[alexc]

@humanus 

 

I took a second look at the log, I think it's probably due to the enabled eMMC. 

EDIT: I added the emmc part to my A7Z dts, it also crashes... So that's definitely the root cause.

I disable it for A7S in my repo for now, you can compile it yourself with a Linux 6.18 kernel or wait for Nick.

 

By the way A733 eMMC seems to use the same eMMC driver as A523, so probably mainline already supports it. 

Edited 18 hours ago by alexc

[Wintermute]

On 4/26/2026 at 8:33 PM, Dalibor Pospíšil said:

@alexc What about SATA support? The a7a board has m.2 pcie where the PentaHAT can be attached (I tested it with a custom sunxi kernel).

 

Also want to ask about SATA support, specifically for PentaHat. I saw a thread on official forum 

https://forum.radxa.com/t/radxa-cubie-a7a-sata-support/29154

looks like electrically there is no issues. But are there necessary drivers in armbian? 

Edited 1 hour ago by Dmitry Maslov
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