Cap Error or Bad Memory
#6
I own multiple boards and have a similar experience with "rock64".
(I own "rockpro64: 3 units", and "rock64: 4 units")

At that time, I implemented the following two countermeasures.
1. Slow down the "ddr-memory" controller.
2. Increase voltage of "ddr-memory".

The effect of improvement was seen in both method.
I don't think there are many people who can do method "2" because it requires hardware modification.
However, method "1" is an easy method with only the standard "dd" command, so it is worth trying.
In fact, with regard to method "1", there are some reports that it has improved. (at "rock64")

Fortunately, none of my "rockpro64" showed such symptoms.
But it's no wonder there are solids with similar problems.


The following is a concrete application example when applying method "1" to "rockpro64".

# Write image to "SD-CARD".
Code:
xz -d -c ./stretch-openmediavault-rockpro64-0.9.14-1159-arm64.img.xz | dd of=/dev/mmcblk0 bs=1M status=progress

# Replace rk3399_ddr on "SD-CARD".
Code:
dd of=./ldr_666.bin if=/dev/zero bs=2K count=36
dd of=./ldr_666.bin if=./rk3399_ddr_666MHz_v1.19.bin bs=2K conv=notrunc
dd of=/dev/mmcblk0p1 if=./ldr_666.bin bs=2K seek=1

*Note)
"/dev/mmcblk0" or "/dev/mmcblk0p1" is a special node of "SD-CARD".
It depends on the operating OS environment.
Forexample,"dev/sda" and "/dev/sda1" or "/dev/sdc" and "/dev/sdc1" ... etc.

If you are lucky, it may improve.
---

Finally, I would like to point out one thing.
"Cap error!" means the capacity (size of the memory installed on the board), not the capacitor.

An error occurred when detecting the installed memory capacity => The installed memory capacity cannot be detected.
(example: 4GB / 2GB / 1GB)
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Messages In This Thread
Cap Error or Bad Memory - by GuyNoIRQ - 03-22-2021, 08:18 PM
RE: Cap Error or Bad Memory - by tllim - 04-05-2021, 02:18 PM
RE: Cap Error or Bad Memory - by GuyNoIRQ - 04-05-2021, 02:28 PM
RE: Cap Error or Bad Memory - by nakato - 04-17-2021, 11:39 PM
RE: Cap Error or Bad Memory - by GuyNoIRQ - 04-20-2021, 01:56 PM
RE: Cap Error or Bad Memory - by t4_4t - 04-22-2021, 08:16 PM

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