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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Thu, 10 Mar 2016 05:19:37 +0000
From:	Vineet Gupta <Vineet.Gupta1@...opsys.com>
To:	Lada Trimasova <Lada.Trimasova@...opsys.com>,
	"linux-snps-arc@...ts.infradead.org" 
	<linux-snps-arc@...ts.infradead.org>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
	Alexey Brodkin <Alexey.Brodkin@...opsys.com>,
	Noam Camus <noamc@...hip.com>
Subject: Re: [PATCH] arc: use little endian accesses

On Thursday 10 March 2016 10:35 AM, Vineet Gupta wrote:
> +CC Noam
>
> On Wednesday 09 March 2016 10:51 PM, Lada Trimasova wrote:
>> > Memory access primitives should use cpu_to_le16, cpu_to_le32, le16_to_cpu
>> > and le32_to_cpu because it is not really guaranteed that drivers handles
>> > any ordering themselves.
> That is the driver issue. readxx as API simply returns data in native endianness.
> We've had EZChip running big endian and so far and they didn't need this change.
>
>> > 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.
>
> Alexey knows about this stuff - this was discussed on lkml back in 2013 when he
> was fighting the Xilinx systemAce driver endian issues
>

Do you need "native-endian" DT entry in nsimosci DT bindings for uart ?