Rpi cm5 support

bkbartk · November 19, 2024, 6:26pm

github.com/home-assistant/operating-system

Add initial support for Raspberry Pi CM5 on Yellow

home-assistant:dev ← home-assistant:yellow-cm5

opened 10:59AM - 12 Nov 24 UTC

Add support for Raspberry Pi CM5 on Yellow. Most of the core work is the device …tree with definition of Yellow peripherals, and U-Boot patches adding support for PCIe/NVMe for BCM2712, which is not present in the upstream U-Boot. Yellow has been migrated to U-Boot 2024.10 which already has basic support for BCM2712. Other Raspberry Pi targets are still left 2024.01, so we will temporarily have two patchsets for RPi. The PCIe/NVMe implementation in U-Boot is inspired by Raspberry Pi's downstream Linux implementation, and it might be worthwhile to check upstream implementation [1] once it gets finished but at the time of writing the patches, I was unable to make the controller work with changes from the v2 of the series. The device tree for CM5 uses the same aliases of serial ports and other peripherals to match CM4 on Yellow, making CM5 a drop-in replacement of the CM4. Of course, the OS must be updated first before swapping the modules. For NVMe-only installs (i.e. those using CM4 Lite or being installed wittingly directly to NVMe) no further steps should be needed. For installations running from eMMC, the CM5 must be bootstrapped using the `rpiboot` utility, because the EEPROM bootloader doesn't support `BCM-USB-MSD` boot mode on CM5 anymore. **Things known to be not working:** **Factory reset in U-Boot** Because GPIOs are handled by RP1 chipset connected over PCIe, there is no support for reading and setting GPIOs in current U-Boot. Adding at least some rudimentary driver to control GPIOs will be needed to make the standard Yellow's factory reset working. **U-Boot USB** USB (the dwc2 peripheral) doesn't seem to be working and can't access the ports behind the USB hub, neither can't be used for USB Mass Storage (after running `ums` command in U-Boot the USB device fails to be enumerated on host). This is also blocker for reflashing the Yellow's CM from U-Boot. [1] https://lore.kernel.org/all/[email protected]/ ## Summary by CodeRabbit - **New Features** - Added NVMe as a boot target for the Raspberry Pi Compute Module 4, enhancing boot options. - Introduced a new driver for the Broadcom STB reset controller and a new driver for the Broadcom RESCAL reset controller. - Added basic support for the BCM2712 PCIe controller, improving compatibility and functionality. - Implemented a new command `fileenv` in U-Boot to read files into environment variables. - Added device tree configurations for the Compute Module 5. - **Bug Fixes** - Reverted changes that caused boot hangs with USB devices on Raspberry Pi 4. - Addressed probing issues for the PCIe controller by introducing a `u-boot,no-probe` property. - **Documentation** - Updated configuration files to reflect new device tree settings for Compute Module 5 and adjustments for Compute Module 4. - **Chores** - Enhanced U-Boot configuration for Raspberry Pi 4 with new USB gadget functionalities and support for BCM2712 chipset.

does this mean there will be an RPI CM5 and it will be compatible with the yellow?

Sir_Goodenough · November 19, 2024, 8:48pm