Trouble installing bullseye on Rock Pi 4 A

[Christian Kastner]

Hi,

For some reason, I'm not getting a signal via HDMI when running the
bullseye installer from the prepared SD card images. I thought this
might be a monitor issue, but booting a microSD card with the
manufacturer's image shows that this is not the case.

Any ideas what could be going on? There's an eMMC attached, but knowing
that it might affect the boot process, I have zeroed it out.

I'm doubtful that it's the installer. Yesterday, I finished an
installation on a RockPro64, a similar platform, without issues.

I'd attach a serial cable but the Rock Pi 4 requires on capable of
1.5Mbps and none of my cables are. I thought I'd ask here before
purchasing one.

Best,
Christian

[Gene Heskett]

Post by Christian Kastner
Hi,
For some reason, I'm not getting a signal via HDMI when running the
bullseye installer from the prepared SD card images. I thought this
might be a monitor issue, but booting a microSD card with the
manufacturer's image shows that this is not the case.
Any ideas what could be going on? There's an eMMC attached, but
knowing that it might affect the boot process, I have zeroed it out.
I'm doubtful that it's the installer. Yesterday, I finished an
installation on a RockPro64, a similar platform, without issues.
I'd attach a serial cable but the Rock Pi 4 requires on capable of
1.5Mbps and none of my cables are. I thought I'd ask here before
purchasing one.
Best,
Christian

On the R-pi4B, its a bit bitchy, and you have to edit something to up
the signal swing before it works on the pi's. Since this too uses mali
video, I would not be surprised if it didn't need a boost too.

But I can't tell you where to edit, everybody has to be different, and
nobody has any for sale. My own experience with the earlier hardkernel
(korean) version was nice running armbian but the spi didn't work and
questions about it were ignored. Armbian also did not have a realtime
preemptable kernel, a must for my application. I do have one for the
pi3-4's, but I had to build it, no support from the foundation and then
figure out how to install it. But it works well, with uptimes in months.
This does look like an upward step in capabilities so I might be
interested in testing one.

[Christian Kastner]

Post by Gene Heskett
On the R-pi4B, its a bit bitchy, and you have to edit something to up
the signal swing before it works on the pi's. Since this too uses mali
video, I would not be surprised if it didn't need a boost too.

The weird thing is, until Thursday it was running a vanilla Debian
install flawlessly, I just wanted to re-image cleanly.

Post by Gene Heskett
This does look like an upward step in capabilities so I might be
interested in testing one.

If you mean the Rock Pi 4, I must say I do like it. It's compact, and
the optional heatsink + M.2 extension board fit together snugly. I'd
also add an RTC battery.