next/master bisection: baseline.login on ox820-cloudengines-pogoplug-series-3

Russell King - ARM Linux admin linux at
Fri Dec 18 09:00:18 EST 2020

On Fri, Dec 18, 2020 at 01:48:09PM +0000, Guillaume Tucker wrote:
> Please see the bisection report below about a boot failure on
> ox820-cloudengines-pogoplug-series-3.  There was also a bisection
> yesterday with next-20201216 which landed on the same commit, on
> the same platform and also with oxnas_v6_defconfig.  I'm not
> aware of any other platform on showing the same
> regression.

Ah, I bet I know what's happening.

We test for the presence of VFP by issuing an instruction to read
FPSID. If VFP is not present, this will raise an undefined instruction
exception, and we expect to head into the vfp_testing_entry code.

I bet Pogoplug, being an ARM11 MPCore platform, either raises an
exception here.

We probably need to also rework the code in vfp_init() as well to
register a temporary hook when reading the FPSID.

RMK's Patch system:
FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last!

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