The BeagleBone AI-64 spec indicates 4 GB of DDR4 RAM, but mine is showing only 2GB total. Has anyone else seen this?
Hi @andrew8 , the AI-64 has 4GB installed, the other 2GB is reserved in the default image thru remoteproc for the other companion cores (c6, c7x, and R5)…
We have a custom device tree for you if you’d like to disable the other cores and use all 4GB with the A72’s…
k3-j721e-beagleboneai64-no-shared-mem.dtb
Factory Image update (without reflashing)…
sudo apt update
sudo apt install --only-upgrade bb-j721e-evm-firmware generic-sys-mods
sudo apt upgrade
Update U-Boot:
Run both of these scripts to ensure only tiboot3.bin is in boot0, the pre-production image we tried to do more in boot0 partition, but failed…
sudo /opt/u-boot/bb-u-boot-beagleboneai64/install-emmc.sh
sudo /opt/u-boot/bb-u-boot-beagleboneai64/install-microsd.sh
sudo reboot
Now edit extlinux.conf and force that dtb file
(default)
root@BeagleBone:~# free -h
total used free shared buff/cache available
Mem: 2.1Gi 555Mi 1.1Gi 2.0Mi 496Mi 1.4Gi
Swap: 0B 0B 0B
fdt /k3-j721e-beagleboneai64-no-shared-mem.dtb
root@BeagleBone:~# free -h
total used free shared buff/cache available
Mem: 3.6Gi 491Mi 2.7Gi 2.0Mi 453Mi 3.0Gi
Swap: 0B 0B 0B
so in /boot/firmware/extlinux/extlinux.conf just set:
fdt /k3-j721e-beagleboneai64-no-shared-mem.dtb
Regards,
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Will there be a way in the future to apportion memory between the different processors, in general I would guess most people would want more memory for the 72s but still may want to use the other cores/
Users can adjust the memory carve out as needed. In our current out of box example, an edge ai use case was setup as default.
Regards,
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Hi Robert, is there some documentation on how to do this?
Cheers
Andy
It’s a reserved memory node in the device tree board file. Do a git pull under /opt/source/dtb*/ and you’ll have the latest source…
Thanks Robert