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


Steve Pavao
 


On Nov 4, 2019, at 11:11 AM, Adrian Bunk <bunk@...> wrote:

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.

To conitnue to be able to use the 32-bit app support, perhaps I must do this:

DEFAULTTUNE_virtclass-multilib-lib32 = “armv7a -mno-fix-cortex-a53-843419 -mno-fix-cortex-a53-835769”

I’ll give it a try.

- Steve Pavao
Korg R&D


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