Banana Pi BPI-R4, Detected DRAM Size: 0 Mb

Banana Pi Router design BPI-R4(MT7988)
1

Hi, Just get BPI-R4 from Ali. Burn OpenWRT to sdcard and saw only this messages from UART.

IMG_20250211_191750
IMG_20250211_1917501500×1010 150 KB

Is that hardware malfunction or my curved hands?

Thanks.

2

it certainly looks like an HW issue … have you tried other non-openwrt builds ? … it may be an issue with openwrt snapshot (there were a few commits that changed u-boot)

3

U-boot doesn’t have anything to do with RAM detection.

4

same with ubuntu image.

5

Why new user?

Ram detection is done in atf (bl2). And because of the filogic is not supported by upstream atf,i guess all systems using code from mtk-atf.

I also guess it is a hardware issue. Have you changed anything on your board?

6

I’ve been waiting a long time for a confirmation email, and have signed up for my old mailbox :slight_smile:

Didn’t change anything, just installed the fan, plugged in the BPI-R4-NIC-BE14 and set the sw4 to on.

7

I have something different.

DDR4 preloader -

NOTICE:  EMI: Using DDR4 settings
NOTICE:  EMI: Detected DRAM size: 0 MB

mt7988-DDR4.txt (102,3 КБ)

COMB preloader - booting, but unstable

NOTICE:  EMI: Using DDR unknown settings
NOTICE:  EMI: Detected DRAM size: 4096 MB

mt7988-COMB.txt (70,8 КБ)

UPDATE The fourth core is dead/unstable. So far, everything is fine without it.

+        cpus {
+               /delete-node/ cpu@3;
+       };

        memory {
                reg = <0x00 0x40000000 0x00 0x10000000>;
        };

......

- &cpu3 {
-        proc-supply = <&rt5190_buck3>;
- };