RE: [PATCH 2/2] arc: hsdk_defconfig: enable CONFIG_ARC_UBOOT_SUPPORT

From: Alexey Brodkin
Date: Tue Feb 05 2019 - 11:51:27 EST

Hi Vineet, Corentin,

> -----Original Message-----
> From: Vineet Gupta <vgupta@xxxxxxxxxxxx>
> Sent: Tuesday, February 5, 2019 7:42 PM
> To: Eugeniy Paltsev <paltsev@xxxxxxxxxxxx>; clabbe@xxxxxxxxxxxx
> Cc: linux-kernel@xxxxxxxxxxxxxxx; alexey.brodkin@xxxxxxxxxxxx; khilman@xxxxxxxxxxxx; linux-snps-
> arc@xxxxxxxxxxxxxxxxxxx
> Subject: Re: [PATCH 2/2] arc: hsdk_defconfig: enable CONFIG_ARC_UBOOT_SUPPORT
> On 2/5/19 3:42 AM, Eugeniy Paltsev wrote:
> > Hi Corentin,
> >
> > In case of devboards (like HSDK) we really often disable bootloader and load
> > Linux image in memory via JTAG. Enabling CONFIG_ARC_UBOOT_SUPPORT by
> > default will break it as we will try to interpret some junk in a registers
> > as a pointers to bootargs/etc which aren't set by anyone in case of JTAG using.
> >
> > So it isn't a good idea to have CONFIG_ARC_UBOOT_SUPPORT enabled by default.
> Right.
> It is difficult to accommodate everyone's needs (often conflicting) in a single
> defconfig.
> Can you folks create an out-of-tree defconfig or some such.

I do think there's a proper solution which [hopefully] makes both parties happy.
Eugeniy is about to send-out a patch which allows us to not care about
garbage in R0/R2 when running after U-Boot.