RPi3 start.elf regression: garbled serial, broken USB in UEFI
Nobody has claimed this yet.
Assessment
- Difficulty
- 5/5
- Estimated time
- Over a week
- Newbie friendliness
- 25/100
- Issue type
- Bug
- Clarity
- Mostly clear
- Activity status
- Stale
- Tech stack
- raspberry-pi
- Domain
- embedded-iot, operating-systems
Research direction
Start by comparing the v1.22 RPi3 release with the latest VPU start and fixup files, following the reproduction steps in the issue. Review the UEFI Tiano Core mbox clock query and the linked pftf/RPi3 issue while checking UART and DWC2 USB behavior. Done means the firmware regression is explained and working serial and USB behavior is restored or the incompatibility is documented.
Written by the indexing model from the issue text.
Description
This was seen in UEFI (Tiano Core) build for RPi3 with the latest VPU firmware. Symptoms: garbled UART output and DWC2 USB2 stopped working. Now, for USB the UEFI fw was querying mbox interface for the reported clock, so this could mean the reported clock was wrong.
Tracked https://github.com/pftf/RPi3/issues/15
To reproduce: Grab latest (v1.22) release from https://github.com/pftf/RPi3/releases. It should boot with working USB and non-garbled UART. Now replace the VPU bits (start + fixup) with your latest. See USB not working, see garbled UART.
Could someone explain why we might be seeing this behavior?
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- No language data
- Stars
- 5.6k
- Forks
- 1.7k
- PR merge metrics
- No merged PRs in 30d
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