*** This bug is a duplicate of bug 1848790 ***
https://bugs.launchpad.net/bugs/1848790
I have a PI 4 (4GB)
I loaded and installed the arm64 eoan
USB didn't work, ssh did
I set total_mem=1024
USB worked
I set total_mem=3072
USB failed
I set total_mem=1024 and loaded the linux image:
wget
https://people.canonical.com/~hwang4/rpiv2/arm64/linux-image-5.3.0-1008-raspi2_5.3.0-1008.9+newupdate_arm64.deb
wget
https://people.canonical.com/~hwang4/rpiv2/arm64/linux-modules-5.3.0-1008-raspi2_5.3.0-1008.9+newupdate_arm64.deb
sudo dpkg -i linux-modules-5.3.0-1008-raspi2_5.3.0-1008.9+newupdate_arm64.deb
sudo dpkg -i linux-image-5.3.0-1008-raspi2_5.3.0-1008.9+newupdate_arm64.deb
sudo reboot
USB Worked
I commented out the total_mem=3072
USB failed
I believe the following will help:
In the raspberry pi git (4.19.y)
https://github.com/raspberrypi/linux/issues/3093
hitmoon commented on 12 Aug
"I've created a trivial patch to add bounce buffers on ARM64 for
pcie-bcrmstb.
pcie-brcmstb-bounce64.patch.zip
I tried this patch, it works for me!
All 4G memory is alive now, COOL !! :-)
Thanks @yaroslavros !
This fixed my linux image for my home rolled 19.04 ubuntu so I hope it
fixes yours
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https://bugs.launchpad.net/bugs/1848703
Title:
Raspberry Pi 4 - USB Bus not detecting any devices
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