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Message-Id: <201308190958.54613.arnd@arndb.de>
Date: Mon, 19 Aug 2013 09:58:54 +0200
From: Arnd Bergmann <arnd@...db.de>
To: Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
Cc: Russell King <linux@....linux.org.uk>,
Jason Cooper <jason@...edaemon.net>,
Andrew Lunn <andrew@...n.ch>,
Gregory Clement <gregory.clement@...e-electrons.com>,
Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC v1 5/5] ARM: mvebu: add board init for Armada 1500
On Monday 19 August 2013, Sebastian Hesselbarth wrote:
> AFAIK, there is Armada 1500 (88de3100) used in every Google TV 2nd Gen
> devices, some older multimedia boxes also used Armada 1000 (88de3010),
> and Chromecast comprises Armada 1500-mini (88de3005).
According to the chromecast kernel sources (which seem to have all the
gtv stuff in them), they changed the CPU core between minor versons
of the 88de3100:
PJ4 based:
- MV88DE3100_BG2_A0
- MV88DE3100_BG2_A1
Cortex-A5 or Cortex-A9 based:
- MV88DE3100_BG2_CD
- MV88DE3100_BG2_CZ
- MV88DE3100_BG3
Those are Kconfig strings, I don't know how those correspond to
chip identification registers or labels printed on the SoC package.
> We should be able to find out if it is PJ4B or Cortex-A9 by checking
> any CPU register?
/proc/cpuinfo will tell you what core you have, see
http://wiki.casthacks.com/index.php?title=Google_ChromeCast_Specs:
CPU implementer : 0x41 # 0x41 == ARM Ltd
CPU architecture: 7 # 0x07 == ARMv7
CPU variant : 0x3 # 0x03 == Core revision r3
CPU part : 0xc09 # 0xc0? == Cortex-A?, 0xc09 == A9
CPU revision : 0 # 0x00 == minor revision r3p0
On http://forum.gtvhacker.com/star-vap430-f40/topic972.html, I found
this for a PJ4 based 88de3100:
CPU implementer : 0x56
CPU architecture: 7
CPU variant : 0x2
CPU part : 0x584
CPU revision : 1
Comparing those to other bits I found on the web, it actually seems to
be a PJ4B rather than the original PJ4.
Arnd
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