> Date: Sun, 9 Aug 2020 18:52:57 +0000 (UTC)
> From: Doug Moss <dougmoss...@yahoo.com>
> 
> In the UEFI (1.16) configuration, I have changed
> from default "ACPI" to "ACPI + devicetree"
> from default "Arasan SDHCI" to "eMMC2 SDHCI"
> (Is this description
> https://mail-index.netbsd.org/port-arm/2017/07/30/msg004328.html
> accurate that the eMMC2 uses the sdhost driver, freeing up sdhc for
> the wifi chip?)

eMMC2 is new on the rpi4 and uses the sdhc(4) driver, so that
description doesn't apply.  But switching makes the other sdhc(4)
available for the wifi.

> Incidentally, the line in the dmesg that
> bwfm0: failed loadfirmware of file brcmfmac43455-sdio.bin
> Is that a problem?

Run fw_update and reboot.  The wifi should work after that.

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