Re: [meta-raspberrypi] poky linux build fails if ARM erratum mfix linker switch is specified


Adrian Bunk
 

On Mon, Nov 04, 2019 at 10:48:57AM -0500, Steve Pavao wrote:

On Nov 3, 2019, at 1:25 PM, Adrian Bunk <bunk@...> wrote:

On Sun, Nov 03, 2019 at 05:56:45PM +0000, Andrei Gherzan wrote:
On 3 November 2019 13:18:53 GMT, Khem Raj <raj.khem@...> wrote:
On Sun, Nov 3, 2019 at 2:46 AM Andrei Gherzan <andrei@...>
wrote:
I was thinking about this. The erratum seems to show that this
applies
to all revisions of a53. So it sounds like we should add it in
`tune-cortexa53.inc`.
Up to r0b4 only so maybe not all a53 implementations are impacted
As far as I know that is the latest revision. Do you mean that newer revision might come up with this fixed?
It is fixed in some r0p4 implementations, indicated in REVIDR[8].
I am closer to understanding why I experience an error when building with the ARM errata switches.

I believe it is related to 32-bit app support in my poky Linux 64-bit build (I add this to support vcgencmd and vcdbg 32-bit apps.)

When I remove the 32-bit support, the build completes OK. As of now, adding the following seems to work fine to acheive this:

TARGET_CC_ARCH_append += " -mfix-cortex-a53-843419 -mfix-cortex-a53-835769”

Something in the following block seems to be the culprit.:

# for vcgencmd and vcdbg 32-bit executable support in the OS image (comment out for -c populate_sdk)
require conf/multilib.conf
MULTILIBS = "multilib:lib32"
DEFAULTTUNE_virtclass-multilib-lib32 = "armv7a"
IMAGE_INSTALL_append += " vcgencmd lib32-glibc lib32-libgcc lib32-libstdc++ vcdbg rpi-setup \


I will post again when I have localized the build problem further. Maybe there’s some 64-bit vs. 32-bit build confusion going on, and the armv7a default tune switch for 32-bits is colliding with the errata switches.
The errata switches are only valid for aarch64, not for armv7a.
There is likely some kind of "invalid option" earlier in your build.

- Steve Pavao
Korg R&D
cu
Adrian

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"Only a promise," Lao Er said.
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