From: arnd@arndb.de (Arnd Bergmann)
To: linux-arm-kernel@lists.infradead.org
Subject: Virtual addresses, ioremap, vmalloc, etc
Date: Tue, 01 Dec 2015 15:45:27 +0100 [thread overview]
Message-ID: <29001219.Rz4slfYDMi@wuerfel> (raw)
In-Reply-To: <565DB036.3010306@free.fr>
On Tuesday 01 December 2015 15:35:34 Mason wrote:
>
> Thanks for the detailed answer.
>
> One more thing: when I configure earlyprintk, I'm supposed to provide
> physical AND virtual address of the UART.
>
> If I'm not using a hard-coded P2V mapping, and instead rely on ioremap,
> how am I supposed to know the virtual address of the UART?
You can pick any number that has the correct alignment. Just keep using
the same number that you get with the 0xf0000000 base, and it should be
fine, the kernel will set up a section mapping for you.
Arnd
next prev parent reply other threads:[~2015-12-01 14:45 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-12-01 12:08 Virtual addresses, ioremap, vmalloc, etc Mason
2015-12-01 13:15 ` Arnd Bergmann
2015-12-01 14:35 ` Mason
2015-12-01 14:45 ` Arnd Bergmann [this message]
2015-12-01 14:50 ` Sebastian Frias
2015-12-01 16:30 ` Nicolas Pitre
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