From: Albert ARIBAUD <albert.u.boot@aribaud.net>
To: u-boot@lists.denx.de
Subject: [U-Boot] rpi USB address question
Date: Mon, 6 Jul 2015 15:10:29 +0200 [thread overview]
Message-ID: <20150706151029.2f624fca@lilith> (raw)
In-Reply-To: <CAPnjgZ2gKiA6qr0A-+HhCyLkitxH3SS7rW0M3aB9OsDzV79c4w@mail.gmail.com>
Hello Simon,
On Mon, 6 Jul 2015 06:35:23 -0600, Simon Glass <sjg@chromium.org> wrote:
> Hi Stephen,
>
> I see in the kernel device tree that the rpi uses address 0x7e980000
> for the DWC2 USB controller. But in U-Boot CONFIG_USB_DWC2_REG_ADDR is
> set to 0x20980000. Is there some sort of translation going on here?
https://www.raspberrypi.org/wp-content/uploads/2012/02/BCM2835-ARM-Peripherals.pdf
Section 1.2.3 / page 6
"Physical addresses range from 0x20000000 to 0x20FFFFFF for peripherals.
The bus addresses for peripherals are set up to map onto the peripheral
bus address range starting at 0x7E000000. Thus a peripheral advertised
here at bus address 0x7Ennnnnn is available at physical address
0x20nnnnnn"
Amicalement,
--
Albert.
next prev parent reply other threads:[~2015-07-06 13:10 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-06 12:35 [U-Boot] rpi USB address question Simon Glass
2015-07-06 13:10 ` Albert ARIBAUD [this message]
2015-07-07 13:52 ` Simon Glass
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