Hi all,
The DTS resync between 2018.09 and 2018.11 seems to have broken the MMC
support for the Linksprite pcDuino (A10) and pcDuino v3 (A20) boards.
The resync happened in b9d59d0 [1] and 3c92cca [2], after which u-boot
doesn't recognize the MMC controller and freezes the board (exactly the
same happens on the v3 board).
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U-Boot SPL 2018.11 (Dec 31 2018 - 14:36:52 +0000)
DRAM: 1024 MiB
CPU: 1008000000Hz, AXI/AHB/APB: 3/2/2
Trying to boot from MMC1
U-Boot 2018.11 (Dec 31 2018 - 14:36:52 +0000) Allwinner Technology
CPU: Allwinner A10 (SUN4I)
Model: LinkSprite pcDuino
I2C: ready
DRAM: 1 GiB
MMC:
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Reverting these commits solve the problem and the boards boot correctly.
Initially I thought this might be due to removing the
mmc0_cd_pin_reference_design (syncing that from the kernel into u-boot),
which was discussed here [3] and was considered as a move that might
break MMC on some boards, but re-adding that reference pin only in the
pcduino DTSes did not resolve the freeze.
Questions:
- A similar board - where the reference pin is used for CD - is the
Cubieboard 2. Can someone test 2018.11 on it to see if it freezes as
well? Out of A20, I have a Bananapro, but that's using a non-reference
pin for CD, and boots fine.
- There are some clock-related changes in this DTS resync, however I
have less than optimal experience with clocks. Can someone help check if
these changes might cause the issue?
Thanks,
Zoltan H
[1]
http://git.denx.de/?p=u-boot.git;a=commit;h=b9d59d08a6c7362a9558dd5f67cdf85cc3a1b7c8
[2]
http://git.denx.de/?p=u-boot.git;a=commit;h=3c92cca3cda0d72c11c41bc0b07edcff127cf194
[3] https://lkml.org/lkml/2017/4/19/631
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