Can't access mmc #0 on mt7623 when booted from external SD

[David Woodhouse]

On Tue, 2020-06-16 at 18:59 +0200, Michael Nazzareno Trimarchi wrote:
> On Tue, Jun 16, 2020 at 6:57 PM David Woodhouse <dwmw2 at infradead.org> wrote:
> > 
> > On Tue, 2020-06-16 at 18:21 +0200, Michael Nazzareno Trimarchi wrote:
> > > Hi David
> > > 
> > > On Tue, Jun 16, 2020 at 6:16 PM David Woodhouse <dwmw2 at infradead.org> wrote:
> > > > 
> > > > The Banana Pi R2 bootloader will load U-Boot from either the internal
> > > > eMMC, or the external SD card if the latter is present.
> > > > 
> > > > If booted from the eMMC (and an SD card is subsequently inserted), both
> > > > work from U-Boot. Both also work from Linux, whichever device is booted
> > > > from.
> > > > 
> > > > If booted from SD, the internal eMMC cannot be accessed from U-Boot.
> > > > This makes it slightly difficult for me to write a U-Boot script which
> > > > installs OpenWRT from the SD card to the internal eMMC...
> > > 
> > > I'm thinking that bootrom do the right job for you when both are working.
> > 
> > Yes. It does seem likely that when loading U-Boot from the eMMC, the
> > preloader is initialising it for us. But when the preloader loads
> > U-Boot from the SD card, it possibly doesn't initialise the eMMC
> > controller at all.
> > 
> > The Linux driver does cope with this, and drives the internal eMMC.
> > Perhaps there's just some init code missing from the U-Boot mtk-sd
> > driver?
> 
> what dts are you using and config? I don't find Banana PI R2

It's mt7623n_bpir2_defconfig
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