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Support Raspberry Pi 3b Plus #6

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andhe opened this issue Aug 8, 2018 · 1 comment
Closed

Support Raspberry Pi 3b Plus #6

andhe opened this issue Aug 8, 2018 · 1 comment

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@andhe
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andhe commented Aug 8, 2018

Hi,

Duplicating the recipe for 3b to support 3b-plus doesn't look like a good idea to me, but I think I might have found a different solution (which I haven't tested at all yet).

The kernel and bootloader should have support for 3b-plus in Debian Buster in current versions (u-boot 2018.5 and linux 4.17). The 3b-plus has a separate dtb though, so the right one needs to be selected at boot.

AIUI Just commenting out this line should do it:

U_BOOT_FDT="broadcom/bcm2837-rpi-3-b.dtb"

in https://github.com/go-debos/debos-recipes/blob/master/debian/arm64/image-rpi3/u-boot-menu/etc/default/u-boot

That should make u-boot-update use "fdtdir" instead of "fdt", which leaves figuring out the exact dtb filename to u-boot (which has the strings for different boards in ./board/raspberrypi/rpi/rpi.c).

Also note that distribution has to be Buster (not Stretch) for this to work (for 3b-plus atleast).

Comments? Thoughts? Is it ok to bump to buster to be able to support both pis with one recipe?
andhe added a commit to andhe/debos-recipes that referenced this issue Aug 22, 2018
@andhe
Disable U_BOOT_FDT and let u-boot figure out the dtb name
3ba9c2f 
By not explicitly specifying a dtb filename, u-boot will probe
the hardware and use a suitable filename and then go search
in U_BOOT_FDT_DIR for that. This means it's possible to use
the same configuration for multiple different boards (by just
shipping all of their dtbs).

See go-debos#6
@fdanis-oss fdanis-oss mentioned this issue Apr 16, 2019
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@andhe
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andhe commented Jul 22, 2019

While some info in here could be useful for unifying things, as discussed in #13, the discussion about it can continue in #13.

The basic issue this bug report was opened about is resolved thus it can now be closed.

@andhe andhe closed this as completed Jul 22, 2019
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