[PATCH] ARM: add support for BCM2708/BCM2835 and Raspberry Pi
cavokz at gmail.com
Thu Sep 6 05:47:03 EDT 2012
On Thu, Sep 06, 2012 at 09:04:14AM +0000, Arnd Bergmann wrote:
> On Thursday 06 September 2012, Stephen Warren wrote:
> > Questions:
> > * It is asserted (I believe by Broadcom) that the BCM2835 is the only SoC
> > in the series likely to see Linux support. Irrespective, those working
> > on BCM2835 support downstream (see git URL above) have chosen to name
> > the kernel support after the primary SoC (BCM2708) rather than the
> > particular instance in use on the Raspberry Pi (BCM2835). I've followed
> > that here, although I wonder if it's really the correct thing to do?
> Doesn't matter too much. Depending on how different the various broadcom
> SoCs actually are, we might even name this mach-bcm and eventually try to
> merge the existing bcmring into it.
I've some stuff for the BCM4760. Working at clean-room patches, which is
easy because the reference published GPL sources  are based on 2.6.28 and
may look scary (190k lines of register definitions header file, completely
broken and unused monster to manage clocks, no pinctrl, old-style gpios,
reimplementation of pl011, pl080 - old style dma, to say a few).
Moreover many IP blocks are already in the kernel (PL011, PL081, sdhci,
dwc-usb2 in the device-only implementation of s3c-hsotg).
It's incomplete, has a lot of issues. sdhci and usb not working. PMU
BCM59040 is barely implemented, only regulators. But it can boot from
initramfs, minimal user space works. Yeah... a side project, mostly a
I could find some similarities with something in bcmring, while grepping,
but I've never dig into it. I also quickly looked into the Raspberry PI
SoC but I could not find anything familiar. However there could be some
code to share. I'll manage a first post of these patches if interested.
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