[U-Boot] rpi USB address question
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
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-Periphera...
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,
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-Periphera...
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
participants (2)
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Albert ARIBAUD -
Simon Glass