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Re: [Xen-devel] [PATCH v01 2/3] xen/arm: add platform specific definitions for DRA7 evm board

Hi Ian,

On 27/06/14 13:17, Ian Campbell wrote:
+    /* OMAP Linux kernel handles devices with status "disabled" in a
+     * weird manner - tries to reset them. While their memory ranges
+     * are not mapped, this leads to data aborts, so skip these devices
+     * from DT for dom0.
+     */

I think this should be done in common code, either by default (if that
makes sense) or using a new quirk flag.

Both of these solutions doesn't make sense to me. A device which is not available should not be touch by the kernel. In most of the case, Linux ignores a device which is not available (see amba/platform register code).

For instance, some board has the same SOC but with different devices enabled/disabled. In this case, there is usually a common device tree with all enabled/disabled, and a specific device tree which override some properties.

If OMAP does weird thinks with the device tree, then we should keep it in the platform code.


Julien Grall

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