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Re: [Xen-devel] [PATCH 7/7] xen/arm: Blacklist some sun7i UARTs

On 09/20/2013 10:41 PM, Ian Campbell wrote:
On Fri, 2013-09-20 at 20:02 +0100, Julien Grall wrote:

+    /*
+     * These UARTs share a page with the Xen console UART, so we don't
+     * want to map them through.
+     */
+    DT_MATCH_PATH("/soc@01c00000/serial@01c28000"),
+    DT_MATCH_PATH("/soc@01c00000/serial@01c28400"),
+    DT_MATCH_PATH("/soc@01c00000/serial@01c28800"),
+    DT_MATCH_PATH("/soc@01c00000/serial@01c28c00"),

Can we blacklist all the UARTs via a DT_MATCH_COMPATIBLE? It's better
than relying on the path that can be changed easily in the device tree.

There are other UARTS (at 0x1c29xxx) which could safely be exposed to
dom0. Perhaps it is better to just blacklist the whole lot though.

These UARTs also share the same page, what prevents the user to use these UARTs?

I have noticed that all the UARTs, except UART0, have a property : status = "disabled". So Xen won't map the UART in dom0 memory.

Ultimately this is just a hack for the fact that Xen is not currently
smart enough to figure out which devices conflict in this way...

After my comment above, do we really need to blacklist all the other UARTs? As we only support the cubieboard 2, if we only want a hack, I think we can safely avoid this patch for now.

Julien Grall

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