[U-Boot] [PATCH] arm64 patch: gicv3 support

[FengHua]

> -----Original Messages-----
> From: "Albert ARIBAUD" <albert.u.boot at aribaud.net>
> Sent Time: 2014-02-22 00:38:05 (Saturday)
> To: fenghua at phytium.com.cn
> Cc: u-boot at lists.denx.de, trini at ti.com
> Subject: Re: [PATCH] arm64 patch: gicv3 support
> 
> Hi fenghua at phytium.com.cn,
> 
> On Wed, 15 Jan 2014 16:10:56 +0800, fenghua at phytium.com.cn wrote:
> 
> > From: David Feng <fenghua at phytium.com.cn>
> > 
> > This patch add gicv3 support to uboot armv8 platform.
> > Modifications cover 4 source files, as follows:
> >   gic.S: gicv3 initialization and sgi interrupt raising.
> >   goc.h: gicv3 register definitions.
> >   vexpress_aemv8a.h: add CONFIG_GICV2/CONFIG_GICV3 switch.
> >   start.S: set SCR_EL3.NS bit to 1, gicv3 register of ICC_SRE_EL2
> >            could be accessed only when SCR_EL3.NS=1.
> >            set SCR_EL3.IRQ|FIQ|EA bits, reroute all interrupts to
> >            el3 at all cores, slaves could be waken up by interrupt
> >            only when the interrupt is routed to it when running
> >            at el3.
> > Note: please use the latest gcc 4.8 compiler from linaro 
> >       which support gicv3 system register assembling.
> > 
> > Signed-off-by: David Feng <fenghua at phytium.com.cn>
> > ---
> 
> I am not well-versed enough in aarch64 and GIC, be it v2 or v3, so...
> Is this patch OK as it is, or should a V2 follow with common GIVv2/GICv3
> code merged?
> 
> Amicalement,

hi Albert,
      I am preparing the V2, there are some optimizations. But it's still Armv8 specific.
I would like to consider common Gicv2/Gicv3 code working across armv7 and armv8. 
It's not easy and I have no armv7 test environment.
      Thank you!

Best Regards,
David