[U-Boot] rpi USB address question

[U-Boot] rpi USB address question

[Simon Glass]

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?

Regards,
Simon

[U-Boot] rpi USB address question

[Albert ARIBAUD]

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.

[U-Boot] rpi USB address question

[Simon Glass]

Hi Albert,

On 6 July 2015 at 07:10, Albert ARIBAUD <albert.u.boot@aribaud.net> wrote:
> 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"

Thanks for the link. It looks like I'll need to implement the 'ranges'
property for simple-bus, sadly.

Regards,
Simon