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A comment on Raspberry Pi 4 WiFi stops working at 2560 x 1440 screen resolution. Parent comment

Re:Raspberry Pi 4 WiFi stops working at 2560 x 1440 screen r... by londons_explore on Thursday November 28, 2019 @11:19AM (#21658379)
Remember the Pi has an odd architecture and all the IO passes through the GPU. The GPU doesn't log human readable messages anywhere. There's a good chance the GPU did log a crash or failure, but only broadcoms engineers can see it.
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Re:Raspberry Pi 4 WiFi stops working at 2560 x 1440 screen r... by abainbridge on Thursday November 28, 2019 @11:51AM (#21658659)
Er, really, wow. I didn't know that. Can you point me at some more info for that? Surely the GPIOs don't go via the GPU.
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Re:Raspberry Pi 4 WiFi stops working at 2560 x 1440 screen r... by londons_explore on Thursday November 28, 2019 @12:12PM (#21658812)
It's a BCM2711, and the datasheet is NDA only - typical Broadcom!

The VideoCore (Broadcoms GPU) is the main processor on the thing, and the cluster of ARM cores that run Linux are more of a coprocessor which can only see some of RAM.

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