Hello Karel,
On 01.07.23 00:41, Karel Gardas wrote:
Hello,
while working on STM32H7 I've noticed that rng is not working well.
Tracked that down to stm32h7_rng_enable function not being properly
called as it should be. The function call should be enforced by:
RTEMS_SYSINIT_ITEM(
stm32h7_rng_enable,
RTEMS_SYSINIT_DEVICE_DRIVERS,
RTEMS_SYSINIT_ORDER_LAST_BUT_5
);
but it is not. The problematic code is here:
https://git.rtems.org/rtems/tree/bsps/arm/stm32h7/start/getentropy-rng.c
So far it looks like linker is GCing whole file.
The linker garbage collection doesn't work on a file granularity. It
operates with linker input section. This is why we use the
-ffunction-sections and -fdata-sections GCC options.
The only workaround for
the issue which I've found so far is to add some "hook" function in the
file and call that hook from BSP starting code. This way linker is
enforced to link the file in and then RTEMS_SYSININT_ITEM is correctly
doing its business.
Do you use a custom linker command file? It is important that the KEEP()
directive is used for the linker set:
KEEP (*(SORT(.rtemsroset.*)))
You can look at the linker map file to get more information about what
is going on.
--
embedded brains GmbH
Herr Sebastian HUBER
Dornierstr. 4
82178 Puchheim
Germany
email: sebastian.hu...@embedded-brains.de
phone: +49-89-18 94 741 - 16
fax: +49-89-18 94 741 - 08
Registergericht: Amtsgericht München
Registernummer: HRB 157899
Vertretungsberechtigte Geschäftsführer: Peter Rasmussen, Thomas Dörfler
Unsere Datenschutzerklärung finden Sie hier:
https://embedded-brains.de/datenschutzerklaerung/
_______________________________________________
devel mailing list
devel@rtems.org
http://lists.rtems.org/mailman/listinfo/devel
