[U-Boot] U-Boot PXA support

[Tom Rini <trini@konsulko.com>]

On Tue, May 21, 2019 at 08:44:57AM +0000, Marcel Ziswiler wrote:
> On Thu, 2019-05-16 at 17:02 +0200, Marek Vasut wrote:
> > On 5/16/19 4:53 PM, Marcel Ziswiler wrote:
> > > Hi Tom
> > > 
> > > On Mon, 2019-05-06 at 09:26 -0400, Tom Rini wrote:
> > > > Hey folks,
> > > > 
> > > > I'm attempting, again, to see what we need to do in order to use
> > > > gcc-
> > > > 8.x
> > > > for U-Boot and ran into, again:
> > > > https://patchwork.ozlabs.org/patch/920329/ which in short is that
> > > > when
> > > > using -mcpu=xscale gcc-8.x throws an odd error:
> > > > cc1: error: switch -mcpu=xscale conflicts with -march=armv5te
> > > > switch
> > > > [-Werror]
> > > > 
> > > > Now note, U-Boot isn't passing -march= at all, just -mcpu=xscale
> > > > which
> > > > suggests perhaps something broke in upstream gcc.  Looking at the
> > > > kernel, it's not used -mcpu=xscale ever, just -mtune=xscale but
> > > > that
> > > > leads to different failures (seen here with gcc-7.3):
> > > >   CC      drivers/usb/gadget/pxa25x_udc.o
> > > > {standard input}: Assembler messages:
> > > > {standard input}:779: Error: selected processor does not support
> > > > `pld
> > > > [lr]' in ARM mode
> > > > {standard input}:1201: Error: selected processor does not support
> > > > `pld [r7]' in ARM mode
> > > > {standard input}:2519: Error: selected processor does not support
> > > > `pld [r3]' in ARM mode
> > > > {standard input}:2796: Error: selected processor does not support
> > > > `pld [r3]' in ARM mode
> > > > 
> > > > So, what should we do about this?  Is there still active interest
> > > > in
> > > > supporting the PXA platforms?  Thanks folks!
> > > 
> > > We are actually still shipping Colibri PXA270 modules for another
> > > one
> > > or two years I believe after which Marvell stops selling us chips.
> > > 
> > > The strange thing is that I build U-Boot master more or less daily
> > > without any known issues currently using the regular gcc 8.2
> > > 2019.01
> > > tool chain from ARM.
> > > 
> > > The only issue is the missing DM_MMC and/or DM_USB conversion which
> > > I
> > > started working on a long time ago but never came around properly
> > > debugging. I may pick that one up tomorrow again.
> > 
> > Would you like to co-maintain the PXA ? :)
> 
> Sure, but it may as well just be the PXA's very last steps before being
> laid to rest (;-p).

To be somewhat serious, active care and maintenance is an important part
of keeping things alive long term.

-- 
Tom
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