linux-kernel - Re: [PATCH] arc: use little endian accesses

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Message-ID: <C2D7FE5348E1B147BCA15975FBA23075F4E8F1A0@us01wembx1.internal.synopsys.com>
Date:	Thu, 10 Mar 2016 09:55:49 +0000
From:	Vineet Gupta <Vineet.Gupta1@...opsys.com>
To:	Alexey Brodkin <Alexey.Brodkin@...opsys.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
	"noamc@...hip.com" <noamc@...hip.com>,
	Lada Trimasova <Lada.Trimasova@...opsys.com>,
	"linux-snps-arc@...ts.infradead.org" 
	<linux-snps-arc@...ts.infradead.org>
Subject: Re: [PATCH] arc: use little endian accesses

On Thursday 10 March 2016 01:14 PM, Alexey Brodkin wrote:
>>> For example, serial port driver doesn't work when kernel is build for
>>> arc big endian architecture.
>> Last I tested Big Endian on SDP with 8250 part + 8250 driver it was working fine.
>> I presume this is the systemC model for device and standard 8250 driver and very
>> likely the model is not fixed endian or something.
> Model is indeed little-endian. We build it only once and than changing
> only "nsim_isa_big_endian" property (which changes only CPU core endianess) may use
> it equally well with little- and big-endian builds of Linux kernel.

Can you or Lada provide more details as to exactly what is not working - what
driver to be precise 8250 or dw-8250.
And where exactly the failure shows up. I want to understand this more
Noam told me off list that he has no issues with both big endian ARC + 8250 in
systemc model or silicon.

-Vineet