Re: [PATCH v1 0/2] Add support for Xilinx ZynqMP SoC

["Edgar E. Iglesias" <edgar.iglesias@gmail.com>]

On Thu, Mar 05, 2015 at 04:50:15PM +0000, Ian Campbell wrote:
> On Thu, 2015-03-05 at 18:27 +1000, Edgar E. Iglesias wrote:
> > From: "Edgar E. Iglesias" <edgar.iglesias@xilinx.com>
> > 
> > Adds support for the Cadence UART in Xilinx ZynqMP. The
> > rest of the ZynqMP platform is discovered via device-tree.
> 
> Is it fully discovered and working out of the box? That would be ....
> awesome!

Yes it would be awesome if we can keep it like that :-)

For a while we were carrying platform code to enable the gic
PLATFORM_QUIRK_GIC_64K_STRIDE but we later realized that we can
work around that issue in the device tree by moving the GICC offsets.

It's possible that we will need to add platform code in the future
as we test out more features. In particular we'll likely need to do
something around power/clock management.


> Do you have any links to any more information about this platform (I'm
> just curious).

This one is a good starting point with follow-up links:
http://www.xilinx.com/products/technology/ultrascale-mpsoc.html

The short version is that the ZynqMP is a chip including both a hard SoC part
(PS, Programmable System) and a "soft" Programmable Logic (PL) FPGA part.
In terms of Virtualization, the hard PS part has quad Cortex-A53s with
EL2 enabled and an SMMU to allow secure device-passthrough of DMA capable devices.

For early access there are two platforms available, an FPGA based
emulation platform (EP108) and a modified version of QEMU. XEN can run
on both those platforms.


> Also, if you could find the time to add a wikipage as a child of
> http://wiki.xenproject.org/wiki/Xen_ARM_with_Virtualization_Extensions
> (like for the other platforms) and add it to the h/w table on the main
> page that would be great.
> 
> The wiki is locked down because of spammers, once you've created an
> account either drop me a line or fill in the form
> http://xenproject.org/component/content/article/100-misc/145-request-to-be-made-a-wiki-editor.html and someone will enable write access for you.

Yes, I'm happy to update the wiki. I've created a user (edgar_igl) and filled out the form.

Best regards,
Edgar


> 
> Ian.
> 
> > 
> > Cheers,
> > Edgar
> > 
> > Edgar E. Iglesias (2):
> >   xen/arm: Add Cadence UART driver
> >   xen/arm: Add Xilinx ZynqMP early printk support
> > 
> >  config/arm64.mk                      |   1 +
> >  docs/misc/arm/early-printk.txt       |   1 +
> >  xen/arch/arm/Rules.mk                |   6 +
> >  xen/arch/arm/arm64/debug-cadence.inc |  45 +++++++
> >  xen/drivers/char/Makefile            |   1 +
> >  xen/drivers/char/cadence-uart.c      | 222 +++++++++++++++++++++++++++++++++++
> >  xen/include/asm-arm/cadence-uart.h   |  55 +++++++++
> >  7 files changed, 331 insertions(+)
> >  create mode 100644 xen/arch/arm/arm64/debug-cadence.inc
> >  create mode 100644 xen/drivers/char/cadence-uart.c
> >  create mode 100644 xen/include/asm-arm/cadence-uart.h
> > 
> 
>