On 16-10-31 02:01 PM, Florian Fainelli wrote:
On 10/31/2016 01:59 PM, Hauke Mehrtens wrote:
On 10/31/2016 07:08 PM, Scott Branden wrote:
Hi Rafal,
On 16-10-29 04:12 AM, Rafał Miłecki wrote:
From: Rafał Miłecki <rafal@xxxxxxxxxx>
Since early BCM5301X days we got abort handler that was removed by
commit 937b12306ea79 ("ARM: BCM5301X: remove workaround imprecise abort
fault handler"). It assumed we need to deal only with pending aborts
left by the bootloader. Unfortunately this isn't true for BCM5301X.
When probing PCI config space (device enumeration) it is expected to
have master aborts on the PCI bus. Most bridges don't forward (or they
allow disabling it) these errors onto the AXI/AMBA bus but not the
Northstar (BCM5301X) one.
Should we only add this workaround code if CONFIG_PCI is on then?
I think all the supported northstar devices have a PCIe controller. We
could add such a CONFIG_PCI check, but I do not see a big advantage.
Actually, I do see a couple disadvantages if we gate this with
CONFIG_PCI: if this problem shows up irrespective of your kernel
configuration, you want the error handler to clear it, not rely on
CONFIG_PCI to be enabled for the error to go away and also, without an
additional ifdef, additional compiler coverage.
A problem with reintroducing this change is that all imprecise data
aborts are ignored, not just PCI. So if you don't actually use PCI in
your system and want to debug other aborts you are unable to. I don't
know if we care about such situation.
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