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Raspberry Pi OS • Re: Buildroot + Raspberry PI CM4 IO Board

Not really comparable, as I've have been manually figuring out what's required for the official 7" display on a Pi5, but maybe you can derive what's needed in your case: I had to add:
  • panel-ilitek-ili9881c.ko kernel module
  • rpi-panel-v2-regulator.ko
  • drm-rp1-dsi.ko
  • i2c-designware-core.ko
  • i2c-designware-platform.ko
  • overlays/vc4-kms-dsi-ili9881-7inch.dtbo overlay
  • dtoverlay=vc4-kms-dsi-ili9881-7inch config.txt line
Without the i2c stuff, the display wouldn't initialize. Once they were all loaded, a new KMS device for the display was up and running. Relevant output of dmesg:

Code:

[    1.141169] drm-rp1-dsi 1f00130000.dsi: bcm2712_iommu_of_xlate: MMU 1000005280.iommu[    1.191974] ili9881c-dsi 1f00130000.dsi.0: supply power not found, using dummy regulator[    1.192421] drm-rp1-dsi 1f00130000.dsi: rp1dsi_host_attach: Attach DSI device name=dsi-7inch channel=0 lanes=2 format=0 flags=0x801 hs_rate=0 lp_rate=0[    1.192907] [drm] Initialized drm-rp1-dsi 1.0.0 0 for 1f00130000.dsi on minor 2[    1.194923] drm-rp1-dsi 1f00130000.dsi: [drm] rp1dsi: Command time (outvact): 11[    1.195273] drm-rp1-dsi 1f00130000.dsi: [drm] rp1dsi: Nominal Byte clock 125000000 DPI clock 83333333 (parent rate 125000000)[    1.417569] Console: switching to colour frame buffer device 90x80[    1.434952] drm-rp1-dsi 1f00130000.dsi: [drm] fb0: drm-rp1-dsidrmf frame buffer device[    1.453191] drm-rp1-dsi 1f00130000.dsi: rp1dsi_bind succeeded

Statistics: Posted by dividuum — Tue Nov 26, 2024 3:00 pm



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