[U-Boot] [U-Boot,v3,1/2] bcm283x: Add pinctrl driver

[Mark Kettenis]

> Date: Mon, 5 Feb 2018 21:06:59 +1100
> From: Jonathan Gray <jsg at jsg.id.au>
> 
> > > booting sd0a:/bsd: open sd0a:/bsd: Device not configured
> > >  failed(6). will try /bsd
> > 
> > How do you find out that it's sd0a instead of sd1a?
> 
> The loaded image protocol I believe.

Actually the OpenBSD bootloader currently only supports loading the
bsd kernel from the same device as the bootloader.  It will always
call that device sd0.  It invokes the device path protocol on the
loaded image handle and then matches that path to a device that
supports the block io protocol.

> > The only thing I can think of that changed with this commit is that now
> > we're honoring the device tree's pinmuxing rules. So if the DT wants to
> > use the sdhost mmc controller instead of the sdhci one, it will actually
> > get muxed there. Before, we didn't mux, so on the rpi3 we just happened
> > to run on the sdhci.
> > 
> > At least the default Linux dtb uses sdhost for SD card access.
> > 
> > So maybe all that happened was a change in device numbers because we end
> > up creating device nodes for mmc devices that don't have a card plugged
> > in (sdhci).
> > 
> > In that case however, I guess it means you really were booting from MMC
> > before, rather than USB?
> 
> There is no driver for either broadcom mmc controller in OpenBSD.
> U-Boot is loaded of the sd card, then bootaa64.efi is loaded
> from usb via "boot_targets=usb0 mmc0 pxe dhcp" and distro bootcmd.
> Root filesystem is then on usb.

Right.  So what the bootloader calls sd0 above is really the usb disk.

> > > boot>
> > > 
> > > U-Boot> part list mmc 0
> > > 
> > > Partition Map for MMC device 0  --   Partition Type: DOS
> > > 
> > > Part    Start Sector    Num Sectors     UUID            Type
> > >   1     8192            8192            00000000-01     0c Boot
> > >   4     16384           26624           00000000-04     a6
> > > U-Boot> part list usb 0
> > > 
> > > Partition Map for USB device 0  --   Partition Type: DOS
> > > 
> > > Part    Start Sector    Num Sectors     UUID            Type
> > >   1     8192            32768           00000000-01     0c Boot
> > >   4     40960           60021540        00000000-04     a6
> > > U-Boot> ls mmc 0:1 /
> > 
> > I assume "ls usb 0:1 /" also works?
> 
> U-Boot> ls usb 0:1 /
>             efi/
>     50248   bootcode.bin
>   2820196   start.elf
>      6551   fixup.dat
>     17794   bcm2710-rpi-3-b.dtb
>     16550   bcm2710-rpi-cm3.dtb
>    422776   u-boot.bin
>        76   config.txt
> 
> 7 file(s), 1 dir(s)
> 
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