[PATCH V4 1/5] ARM: add infra-structure for BCM2835 and Raspberry Pi
From: arnd@arndb.de (Arnd Bergmann)
Date: 2012-09-14 07:50:43
On Friday 14 September 2012, Stephen Warren wrote:
From: Simon Arlott <redacted> The BCM2835 is an ARM SoC from Broadcom. This patch adds very basic support for this SoC. http://www.broadcom.com/products/BCM2835 http://www.raspberrypi.org/wp-content/uploads/2012/02/BCM2835-ARM-Peripherals.pd
Just looked at that document. Funny how they actually put details about the kernel implementation (the static mapping address) into a hardware manual.
Note that the documentation in the latter .pdf assumes the MMU setup that's used on the "VideoCore" companion processor, and does not document physical peripheral addresses. Subtract 0x5e000000 to obtain the physical addresses.
This had escaped me so far. I think we should put this into the device tree
so that the representation of devices in the .dts file matches the one in
the manual, like this
vc-bus {
compatible = "simple-bus";
#address-cells = <1>;
#size-cells = <1>;
ranges = <0x20000000 0x7e000000 0x02000000>;
other devices {
};
};
Arnd