[U-Boot] [PATCH v7 0/7] add support for atheros ath79 based SOCs

[Marek Vasut]

On Sunday, January 17, 2016 at 01:21:29 PM, Wills Wang wrote:
> On 01/17/2016 06:24 PM, Daniel Schwierzeck wrote:
> > 2016-01-17 6:49 GMT+01:00 Wills Wang <wills.wang at live.com>:
> >> On 01/17/2016 03:05 AM, Marek Vasut wrote:
> >>> On Saturday, January 16, 2016 at 07:13:46 PM, Wills Wang wrote:
> >>>> These series of patch add support for atheros ath79 based SOCs in
> >>>> u-boot, at the present moment it's just available for ar933x and
> >>>> qca953x chip.
> >>>> 
> >>>> This patch serises is based on mips_io_v4 branch on u-boot-mips
> >>>> repository
> >>>> [1] and tested on ar933x and qca953x board.
> >>>> 
> >>>> [1]
> >>>> 
> >>>> http://git.denx.de/?p=u-boot/u-boot-mips.git;a=shortlog;h=refs/heads/m
> >>>> ips_ io_v4
> >>> 
> >>> So if I didn't complain about this being sent as separate emails this
> >>> morning.
> >>> Please, do send your patches as a series, not as separate emails.
> >> 
> >> How to send a patch series by patman?
> > 
> > If your git-sendmail config is correctly set up, patman automatically
> > sends the cover letter and then all patches as response to that cover
> > letter.
> > 
> > You have to enable mail threading in git-sendmail. Check that with:
> > 
> > $ git config --get sendemail.thread
> > 
> > To enable it globally:
> > 
> > $ git config --global sendemail.thread true
> 
> Thanks, i will try it for the coming v8.

I got as far as booting my ar9330 rev 1 machine, though it did take considerably 
amount of hackery. I also had to use locked cachelines for stack, because it is
far faster than using the SRAM on ar9331 . You can find my hacks in the 
attachment, most of the stuff there is because arduino yun is repugnant crappy 
piece of hardware and needs some extra treatment.

You should mostly care about the hacks in start.S , in particular the one 
setting bit 3 in CP0 in setup_c0_status seems important on mips 24kc core.
Daniel seems to have some ideas on this too I think, he helped me finding
out there's a problem.

Also, mips_cache_lock_24k does the job for locking the cachelines, but (!) it
is clearly a dirty hack. The start.S needs to be modularized in some way for
this to be properly integrat(ed|able).

In case I select SYS_MIPS_CACHE_INIT_RAM_LOAD , the machine hangs. No idea why,
but I suspect it makes no sense on a machine which has no running DRAM anyway,
so I removed this option.

Change to ddr.c seems correct, the values for DDR1 and DDR2 were swapped, but
I suggest you double-check it.

Ignore my AHB hack in lowlevel_init.S , it's necessary to keep my SPI NOR 
running at low speed, since I am using an FPGA instead of real SPI NOR and
the FPGA implementation of the SPI NOR emulator cannot run at tens of MHz.

I am now looking into implementing ethernet and USB support for ar9331, did
you look into it at all or not ? I'd like to avoid duplicating efforts.

Best regards,
Marek Vasut
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