Atheros AR93xx NAND support

[Warner Losh]

If you had good access to datasheets, plus errata, plus vendor support, you
might be able to get a quality implementation in 3-4 months time, which
would include time to revamp our NAND system. It doesn't include time to
revamp NANDFS, though, which would be another 2-3 months to get rock solid.

Warner

On Thu, Jun 28, 2018 at 2:17 PM, Adrian Chadd <adrian.chadd at gmail.com>
wrote:

> Hi,
>
> There's currently no support for the NAND chip. I started a driver,
> but i reached a point where I realised we'd have to churn our NAND
> layer a bit in order to get it working. The AR934X NAND controller
> isn't a dumb latch and wants to actually issue its own JEDEC commands
> and do DMA.
>
>
>
> -adrian
>
> On Wed, 9 May 2018 at 07:05, Gergely Kiss <mail.gery at gmail.com> wrote:
> >
> > Hi,
> >
> > I have a home project about porting FreeBSD to my beloved Netgear
> > WNDR4300 V.1 board and would like to ask for a little bit of help.
> >
> > The board is basically an Atheros DB120 reference board with a few
> > minor modifications (eg. it does not have SPI flash on-board, only a
> > NAND chip and has custom designed, "patent pending" integrated
> > antennas) so I cloned the DB120 kernel configuration and modified to
> > match the parameters of the Netgear board.
> >
> > As the SPI flash chip is absent, I need to boot FreeBSD off the NAND
> > chip which works fine up to the point where the kernel is loaded but
> > the root filesystem (also residing on the NAND chip) cannot be mounted
> > because of the NAND controller not detected.
> >
> > I'm using FreeBSD CURRENT with the NAND framework and NANDFS support
> > enabled in the kernel configuration according to instructions found on
> > the NAND wiki page [1] but I still can't see the NAND controller
> > detected.
> >
> > Please advise.
> >
> > As per this [2] wiki page, the controller should be detected as
> > "ar934x_nfc0" but I can't see anything like that in the logs:
> >
> > "ar934x_nfc0: <AR934x NAND controller> on apb0"
> >
> > Your help is much appreciated.
> >
> > Thanks,
> > Gergely
> >
> > [1] https://wiki.freebsd.org/NAND
> > [2] https://github.com/freebsd/freebsd-wifi-build/wiki/
> Atheros-ReferenceDB120
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