From: slash.tmp@free.fr (Mason)
To: linux-arm-kernel@lists.infradead.org
Subject: Reading twd_base at run-time
Date: Wed, 01 Apr 2015 14:47:52 +0200 [thread overview]
Message-ID: <551BE8F8.60301@free.fr> (raw)
In-Reply-To: <551BE476.2060102@arm.com>
On 01/04/2015 14:28, Marc Zyngier wrote:
> It is worth mentioning that PERIPH_BASE is *not* an architected
> register, so an implementation is perfectly allowed not to implement it.
> Even on Cortex A9, a UP implementation will report PERIPH_BASE as zero.
> It is still likely to have a TWD though.
I understand now that the kernel cannot reliably discover PERIPH_BASE
at run-time; thus this piece of info must be communicated through DT.
> Indeed. And when probing is so unreliable, it is not worth using it.
Regards.
next prev parent reply other threads:[~2015-04-01 12:47 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-27 16:16 Reading twd_base at run-time Mason
2015-03-27 16:35 ` Marc Zyngier
2015-03-27 20:33 ` Mason
2015-03-27 20:53 ` Russell King - ARM Linux
2015-04-01 12:07 ` Mason
2015-04-01 12:12 ` Russell King - ARM Linux
2015-04-01 12:47 ` Mason
2015-04-01 12:28 ` Marc Zyngier
2015-04-01 12:47 ` Mason [this message]
2015-04-01 13:01 ` Mason
2015-04-01 13:14 ` Marc Zyngier
2015-04-01 14:39 ` Mason
2015-04-01 14:56 ` Marc Zyngier
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