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* Thoughts about U-boot binary size increase
@ 2024-03-28  9:20 Lukasz Majewski
  2024-03-28  9:40 ` Marek Vasut
                   ` (2 more replies)
  0 siblings, 3 replies; 9+ messages in thread
From: Lukasz Majewski @ 2024-03-28  9:20 UTC (permalink / raw)
  To: Tom Rini, u-boot, Simon Glass; +Cc: Marek Vasut, Stefano Babic, Fabio Estevam

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Dear Community,

I'd like to share with you some thoughts about growth of u-boot's
binary size for SPL and u-boot proper.

Board: XEA
SoC  : imx287 (still in active production)
Problem: SPL size constrained to ~55 KiB (This cannot be exceeded). 
	 Board design constraints u-boot proper size to less than ~448
	 KiB


When XEA was added (2019.07):
	- u-boot.sb (SPL): 37 KiB
	- u-boot.img 	 : 401 KiB

Now (2024.04):
	- u-boot.sb (SPL): 40 KiB
	- u-boot.img 	 : 427 KiB

(With a _lot_ of effort put to reduce the size)

Hence, the question - would it be possible to take more concern about
the binary size growth?

Maybe CI could catch patches, which enable by default some features and
the size is unintentionally increased?

I'm open for any feedback and thoughts on "stopping" the binary size
increase.

Best regards,

Lukasz Majewski

--

DENX Software Engineering GmbH,      Managing Director: Erika Unter
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-59 Fax: (+49)-8142-66989-80 Email: lukma@denx.de

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^ permalink raw reply	[flat|nested] 9+ messages in thread

* Re: Thoughts about U-boot binary size increase
  2024-03-28  9:20 Thoughts about U-boot binary size increase Lukasz Majewski
@ 2024-03-28  9:40 ` Marek Vasut
  2024-03-28 10:29   ` Lukasz Majewski
  2024-03-28 12:18 ` Tom Rini
  2024-03-28 12:18 ` Fabio Estevam
  2 siblings, 1 reply; 9+ messages in thread
From: Marek Vasut @ 2024-03-28  9:40 UTC (permalink / raw)
  To: Lukasz Majewski, Tom Rini, u-boot, Simon Glass
  Cc: Stefano Babic, Fabio Estevam

On 3/28/24 10:20 AM, Lukasz Majewski wrote:
> Dear Community,
> 
> I'd like to share with you some thoughts about growth of u-boot's
> binary size for SPL and u-boot proper.
> 
> Board: XEA
> SoC  : imx287 (still in active production)
> Problem: SPL size constrained to ~55 KiB (This cannot be exceeded).
> 	 Board design constraints u-boot proper size to less than ~448
> 	 KiB
> 
> 
> When XEA was added (2019.07):
> 	- u-boot.sb (SPL): 37 KiB
> 	- u-boot.img 	 : 401 KiB
> 
> Now (2024.04):
> 	- u-boot.sb (SPL): 40 KiB

Do you know which symbol(s) grew in here ?

> 	- u-boot.img 	 : 427 KiB
> 
> (With a _lot_ of effort put to reduce the size)
> 
> Hence, the question - would it be possible to take more concern about
> the binary size growth?
> 
> Maybe CI could catch patches, which enable by default some features and
> the size is unintentionally increased?

Try and set CONFIG_BOARD_SIZE_LIMIT and CONFIG_SPL_SIZE_LIMIT for this 
board, that would trip build error if the size grows too large.

^ permalink raw reply	[flat|nested] 9+ messages in thread

* Re: Thoughts about U-boot binary size increase
  2024-03-28  9:40 ` Marek Vasut
@ 2024-03-28 10:29   ` Lukasz Majewski
  0 siblings, 0 replies; 9+ messages in thread
From: Lukasz Majewski @ 2024-03-28 10:29 UTC (permalink / raw)
  To: Marek Vasut; +Cc: Tom Rini, u-boot, Simon Glass, Stefano Babic, Fabio Estevam

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Hi Marek,

> On 3/28/24 10:20 AM, Lukasz Majewski wrote:
> > Dear Community,
> > 
> > I'd like to share with you some thoughts about growth of u-boot's
> > binary size for SPL and u-boot proper.
> > 
> > Board: XEA
> > SoC  : imx287 (still in active production)
> > Problem: SPL size constrained to ~55 KiB (This cannot be exceeded).
> > 	 Board design constraints u-boot proper size to less than
> > ~448 KiB
> > 
> > 
> > When XEA was added (2019.07):
> > 	- u-boot.sb (SPL): 37 KiB
> > 	- u-boot.img 	 : 401 KiB
> > 
> > Now (2024.04):
> > 	- u-boot.sb (SPL): 40 KiB  
> 
> Do you know which symbol(s) grew in here ?

I will need to check it.

> 
> > 	- u-boot.img 	 : 427 KiB
> > 
> > (With a _lot_ of effort put to reduce the size)
> > 
> > Hence, the question - would it be possible to take more concern
> > about the binary size growth?
> > 
> > Maybe CI could catch patches, which enable by default some features
> > and the size is unintentionally increased?  
> 
> Try and set CONFIG_BOARD_SIZE_LIMIT and CONFIG_SPL_SIZE_LIMIT for
> this board, that would trip build error if the size grows too large.

I think that setting CONFIG_BOARD_SIZE_LIMIT and CONFIG_SPL_SIZE_LIMIT
would help for rising the "red flag" of the size limit.

However, I would like to signal that there is a problem with u-boot
size increase.


Best regards,

Lukasz Majewski

--

DENX Software Engineering GmbH,      Managing Director: Erika Unter
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-59 Fax: (+49)-8142-66989-80 Email: lukma@denx.de

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^ permalink raw reply	[flat|nested] 9+ messages in thread

* Re: Thoughts about U-boot binary size increase
  2024-03-28  9:20 Thoughts about U-boot binary size increase Lukasz Majewski
  2024-03-28  9:40 ` Marek Vasut
@ 2024-03-28 12:18 ` Tom Rini
  2024-03-28 12:55   ` Lukasz Majewski
  2024-03-28 12:18 ` Fabio Estevam
  2 siblings, 1 reply; 9+ messages in thread
From: Tom Rini @ 2024-03-28 12:18 UTC (permalink / raw)
  To: Lukasz Majewski
  Cc: u-boot, Simon Glass, Marek Vasut, Stefano Babic, Fabio Estevam

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On Thu, Mar 28, 2024 at 10:20:49AM +0100, Lukasz Majewski wrote:
> Dear Community,
> 
> I'd like to share with you some thoughts about growth of u-boot's
> binary size for SPL and u-boot proper.
> 
> Board: XEA
> SoC  : imx287 (still in active production)
> Problem: SPL size constrained to ~55 KiB (This cannot be exceeded). 
> 	 Board design constraints u-boot proper size to less than ~448
> 	 KiB
> 
> 
> When XEA was added (2019.07):
> 	- u-boot.sb (SPL): 37 KiB
> 	- u-boot.img 	 : 401 KiB
> 
> Now (2024.04):
> 	- u-boot.sb (SPL): 40 KiB
> 	- u-boot.img 	 : 427 KiB
> 
> (With a _lot_ of effort put to reduce the size)
> 
> Hence, the question - would it be possible to take more concern about
> the binary size growth?
> 
> Maybe CI could catch patches, which enable by default some features and
> the size is unintentionally increased?
> 
> I'm open for any feedback and thoughts on "stopping" the binary size
> increase.

I think that's pretty amazingly small growth for nearly 5 years of bug
fixes and feature enhancements that it's likely minor to make granular.
If LTO is not enabled on this platform you should be able to use
buildman to give you a "bloat" list from v2019.07 to v2024.04 and see if
anything sticks out as being something that can be addressed. But that
little growth seems pretty good to me at first glance.

-- 
Tom

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^ permalink raw reply	[flat|nested] 9+ messages in thread

* Re: Thoughts about U-boot binary size increase
  2024-03-28  9:20 Thoughts about U-boot binary size increase Lukasz Majewski
  2024-03-28  9:40 ` Marek Vasut
  2024-03-28 12:18 ` Tom Rini
@ 2024-03-28 12:18 ` Fabio Estevam
  2024-03-28 12:52   ` Lukasz Majewski
  2 siblings, 1 reply; 9+ messages in thread
From: Fabio Estevam @ 2024-03-28 12:18 UTC (permalink / raw)
  To: Lukasz Majewski; +Cc: Tom Rini, u-boot, Simon Glass, Marek Vasut, Stefano Babic

Hi Lukasz,

On Thu, Mar 28, 2024 at 6:20 AM Lukasz Majewski <lukma@denx.de> wrote:
>
> Dear Community,
>
> I'd like to share with you some thoughts about growth of u-boot's
> binary size for SPL and u-boot proper.
>
> Board: XEA
> SoC  : imx287 (still in active production)
> Problem: SPL size constrained to ~55 KiB (This cannot be exceeded).
>          Board design constraints u-boot proper size to less than ~448
>          KiB
>
>
> When XEA was added (2019.07):
>         - u-boot.sb (SPL): 37 KiB
>         - u-boot.img     : 401 KiB
>
> Now (2024.04):
>         - u-boot.sb (SPL): 40 KiB
>         - u-boot.img     : 427 KiB
>
> (With a _lot_ of effort put to reduce the size)
>
> Hence, the question - would it be possible to take more concern about
> the binary size growth?
>
> Maybe CI could catch patches, which enable by default some features and
> the size is unintentionally increased?
>
> I'm open for any feedback and thoughts on "stopping" the binary size
> increase.

In addition to adding CONFIG_BOARD_SIZE_LIMIT and CONFIG_SPL_SIZE_LIMIT checks,
could you try the change below?

diff --git a/arch/arm/mach-imx/mxs/Kconfig b/arch/arm/mach-imx/mxs/Kconfig
index d2e4205c5ce5..ee8c23d0e04f 100644
--- a/arch/arm/mach-imx/mxs/Kconfig
+++ b/arch/arm/mach-imx/mxs/Kconfig
@@ -32,6 +32,7 @@ if ARCH_MX28

 config MX28
        bool
+       select LTO
        default y

I did a quick imx28_xea_defconfig build test here:

U-Boot mainline
---------------

$ ls -al u-boot.img
-rw-rw-r-- 1 fabio fabio 444128 mar 28 09:11 u-boot.img

$ ls -al spl/u-boot-spl.bin
-rwxrwxr-x 1 fabio fabio 39800 mar 28 09:12 spl/u-boot-spl.bin


U-Boot mainline + LTO
---------------------

$ ls -al u-boot.img
-rw-rw-r-- 1 fabio fabio 424144 mar 28 09:14 u-boot.img

$ ls -al spl/u-boot-spl.bin
-rw-rw-r-- 1 fabio fabio 37664 mar 28 09:14 spl/u-boot-spl.bin

^ permalink raw reply related	[flat|nested] 9+ messages in thread

* Re: Thoughts about U-boot binary size increase
  2024-03-28 12:18 ` Fabio Estevam
@ 2024-03-28 12:52   ` Lukasz Majewski
  0 siblings, 0 replies; 9+ messages in thread
From: Lukasz Majewski @ 2024-03-28 12:52 UTC (permalink / raw)
  To: Fabio Estevam; +Cc: Tom Rini, u-boot, Simon Glass, Marek Vasut, Stefano Babic

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Hi Fabio,

> Hi Lukasz,
> 
> On Thu, Mar 28, 2024 at 6:20 AM Lukasz Majewski <lukma@denx.de> wrote:
> >
> > Dear Community,
> >
> > I'd like to share with you some thoughts about growth of u-boot's
> > binary size for SPL and u-boot proper.
> >
> > Board: XEA
> > SoC  : imx287 (still in active production)
> > Problem: SPL size constrained to ~55 KiB (This cannot be exceeded).
> >          Board design constraints u-boot proper size to less than
> > ~448 KiB
> >
> >
> > When XEA was added (2019.07):
> >         - u-boot.sb (SPL): 37 KiB
> >         - u-boot.img     : 401 KiB
> >
> > Now (2024.04):
> >         - u-boot.sb (SPL): 40 KiB
> >         - u-boot.img     : 427 KiB
> >
> > (With a _lot_ of effort put to reduce the size)
> >
> > Hence, the question - would it be possible to take more concern
> > about the binary size growth?
> >
> > Maybe CI could catch patches, which enable by default some features
> > and the size is unintentionally increased?
> >
> > I'm open for any feedback and thoughts on "stopping" the binary size
> > increase.  
> 
> In addition to adding CONFIG_BOARD_SIZE_LIMIT and
> CONFIG_SPL_SIZE_LIMIT checks, could you try the change below?
> 
> diff --git a/arch/arm/mach-imx/mxs/Kconfig
> b/arch/arm/mach-imx/mxs/Kconfig index d2e4205c5ce5..ee8c23d0e04f
> 100644 --- a/arch/arm/mach-imx/mxs/Kconfig
> +++ b/arch/arm/mach-imx/mxs/Kconfig
> @@ -32,6 +32,7 @@ if ARCH_MX28
> 
>  config MX28
>         bool
> +       select LTO
>         default y
> 
> I did a quick imx28_xea_defconfig build test here:
> 
> U-Boot mainline
> ---------------
> 
> $ ls -al u-boot.img
> -rw-rw-r-- 1 fabio fabio 444128 mar 28 09:11 u-boot.img
> 
> $ ls -al spl/u-boot-spl.bin
> -rwxrwxr-x 1 fabio fabio 39800 mar 28 09:12 spl/u-boot-spl.bin
> 
> 
> U-Boot mainline + LTO
> ---------------------
> 
> $ ls -al u-boot.img
> -rw-rw-r-- 1 fabio fabio 424144 mar 28 09:14 u-boot.img
> 
> $ ls -al spl/u-boot-spl.bin
> -rw-rw-r-- 1 fabio fabio 37664 mar 28 09:14 spl/u-boot-spl.bin

Thanks for the tip - I will check if enabling LTO is not causing any
regressions.


Best regards,

Lukasz Majewski

--

DENX Software Engineering GmbH,      Managing Director: Erika Unter
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-59 Fax: (+49)-8142-66989-80 Email: lukma@denx.de

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^ permalink raw reply	[flat|nested] 9+ messages in thread

* Re: Thoughts about U-boot binary size increase
  2024-03-28 12:18 ` Tom Rini
@ 2024-03-28 12:55   ` Lukasz Majewski
  2024-03-28 12:58     ` Tom Rini
  0 siblings, 1 reply; 9+ messages in thread
From: Lukasz Majewski @ 2024-03-28 12:55 UTC (permalink / raw)
  To: Tom Rini; +Cc: u-boot, Simon Glass, Marek Vasut, Stefano Babic, Fabio Estevam

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Hi Tom,

> On Thu, Mar 28, 2024 at 10:20:49AM +0100, Lukasz Majewski wrote:
> > Dear Community,
> > 
> > I'd like to share with you some thoughts about growth of u-boot's
> > binary size for SPL and u-boot proper.
> > 
> > Board: XEA
> > SoC  : imx287 (still in active production)
> > Problem: SPL size constrained to ~55 KiB (This cannot be exceeded). 
> > 	 Board design constraints u-boot proper size to less than
> > ~448 KiB
> > 
> > 
> > When XEA was added (2019.07):
> > 	- u-boot.sb (SPL): 37 KiB
> > 	- u-boot.img 	 : 401 KiB
> > 
> > Now (2024.04):
> > 	- u-boot.sb (SPL): 40 KiB
> > 	- u-boot.img 	 : 427 KiB
> > 
> > (With a _lot_ of effort put to reduce the size)
> > 
> > Hence, the question - would it be possible to take more concern
> > about the binary size growth?
> > 
> > Maybe CI could catch patches, which enable by default some features
> > and the size is unintentionally increased?
> > 
> > I'm open for any feedback and thoughts on "stopping" the binary size
> > increase.  
> 
> I think that's pretty amazingly small growth for nearly 5 years of bug
> fixes and feature enhancements that it's likely minor to make
> granular.

Those results are after using OF_PLATDATA in SPL and other tricks - like
compression of DTB in u-boot proper, so this caused some extra effort
to keep small.

> If LTO is not enabled on this platform 

As Fabio pointed out - I shall check if LTO can be (safely) enabled for
imx287.

> you should be able
> to use buildman to give you a "bloat" list from v2019.07 to v2024.04
> and see if anything sticks out as being something that can be
> addressed. But that little growth seems pretty good to me at first
> glance.
> 


Best regards,

Lukasz Majewski

--

DENX Software Engineering GmbH,      Managing Director: Erika Unter
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-59 Fax: (+49)-8142-66989-80 Email: lukma@denx.de

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^ permalink raw reply	[flat|nested] 9+ messages in thread

* Re: Thoughts about U-boot binary size increase
  2024-03-28 12:55   ` Lukasz Majewski
@ 2024-03-28 12:58     ` Tom Rini
  2024-03-28 13:03       ` Lukasz Majewski
  0 siblings, 1 reply; 9+ messages in thread
From: Tom Rini @ 2024-03-28 12:58 UTC (permalink / raw)
  To: Lukasz Majewski
  Cc: u-boot, Simon Glass, Marek Vasut, Stefano Babic, Fabio Estevam

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On Thu, Mar 28, 2024 at 01:55:22PM +0100, Lukasz Majewski wrote:
> Hi Tom,
> 
> > On Thu, Mar 28, 2024 at 10:20:49AM +0100, Lukasz Majewski wrote:
> > > Dear Community,
> > > 
> > > I'd like to share with you some thoughts about growth of u-boot's
> > > binary size for SPL and u-boot proper.
> > > 
> > > Board: XEA
> > > SoC  : imx287 (still in active production)
> > > Problem: SPL size constrained to ~55 KiB (This cannot be exceeded). 
> > > 	 Board design constraints u-boot proper size to less than
> > > ~448 KiB
> > > 
> > > 
> > > When XEA was added (2019.07):
> > > 	- u-boot.sb (SPL): 37 KiB
> > > 	- u-boot.img 	 : 401 KiB
> > > 
> > > Now (2024.04):
> > > 	- u-boot.sb (SPL): 40 KiB
> > > 	- u-boot.img 	 : 427 KiB
> > > 
> > > (With a _lot_ of effort put to reduce the size)
> > > 
> > > Hence, the question - would it be possible to take more concern
> > > about the binary size growth?
> > > 
> > > Maybe CI could catch patches, which enable by default some features
> > > and the size is unintentionally increased?
> > > 
> > > I'm open for any feedback and thoughts on "stopping" the binary size
> > > increase.  
> > 
> > I think that's pretty amazingly small growth for nearly 5 years of bug
> > fixes and feature enhancements that it's likely minor to make
> > granular.
> 
> Those results are after using OF_PLATDATA in SPL and other tricks - like
> compression of DTB in u-boot proper, so this caused some extra effort
> to keep small.

Yes, and I'm still pretty happy with that. I would encourage you to do
what I suggested, before turning on LTO (as that makes it hard to see
symbol size changes due to the nature of LTO) as what you asked for in
your original email is what I do, and have done for a very long time
now, with 99% of every pull request / branch merge. I'm not saying I
didn't miss anything, but I am saying it's a matter of specific changes
and not a general problem. And if you hadn't previously set the options
to enforce failure to build if hard size constraints are missed, please
do so.

-- 
Tom

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^ permalink raw reply	[flat|nested] 9+ messages in thread

* Re: Thoughts about U-boot binary size increase
  2024-03-28 12:58     ` Tom Rini
@ 2024-03-28 13:03       ` Lukasz Majewski
  0 siblings, 0 replies; 9+ messages in thread
From: Lukasz Majewski @ 2024-03-28 13:03 UTC (permalink / raw)
  To: Tom Rini; +Cc: u-boot, Simon Glass, Marek Vasut, Stefano Babic, Fabio Estevam

[-- Attachment #1: Type: text/plain, Size: 2596 bytes --]

Hi Tom,

> On Thu, Mar 28, 2024 at 01:55:22PM +0100, Lukasz Majewski wrote:
> > Hi Tom,
> >   
> > > On Thu, Mar 28, 2024 at 10:20:49AM +0100, Lukasz Majewski wrote:  
> > > > Dear Community,
> > > > 
> > > > I'd like to share with you some thoughts about growth of
> > > > u-boot's binary size for SPL and u-boot proper.
> > > > 
> > > > Board: XEA
> > > > SoC  : imx287 (still in active production)
> > > > Problem: SPL size constrained to ~55 KiB (This cannot be
> > > > exceeded). Board design constraints u-boot proper size to less
> > > > than ~448 KiB
> > > > 
> > > > 
> > > > When XEA was added (2019.07):
> > > > 	- u-boot.sb (SPL): 37 KiB
> > > > 	- u-boot.img 	 : 401 KiB
> > > > 
> > > > Now (2024.04):
> > > > 	- u-boot.sb (SPL): 40 KiB
> > > > 	- u-boot.img 	 : 427 KiB
> > > > 
> > > > (With a _lot_ of effort put to reduce the size)
> > > > 
> > > > Hence, the question - would it be possible to take more concern
> > > > about the binary size growth?
> > > > 
> > > > Maybe CI could catch patches, which enable by default some
> > > > features and the size is unintentionally increased?
> > > > 
> > > > I'm open for any feedback and thoughts on "stopping" the binary
> > > > size increase.    
> > > 
> > > I think that's pretty amazingly small growth for nearly 5 years
> > > of bug fixes and feature enhancements that it's likely minor to
> > > make granular.  
> > 
> > Those results are after using OF_PLATDATA in SPL and other tricks -
> > like compression of DTB in u-boot proper, so this caused some extra
> > effort to keep small.  
> 
> Yes, and I'm still pretty happy with that.

Ok :-)

> I would encourage you to do
> what I suggested, before turning on LTO (as that makes it hard to see
> symbol size changes due to the nature of LTO) as what you asked for in
> your original email is what I do, and have done for a very long time
> now, with 99% of every pull request / branch merge. I'm not saying I
> didn't miss anything, but I am saying it's a matter of specific
> changes and not a general problem. 

Ok. I will check binman's output for symbol sizes changes.

> And if you hadn't previously set
> the options to enforce failure to build if hard size constraints are
> missed, please do so.
> 

I will.

Thanks for input and help.


Best regards,

Lukasz Majewski

--

DENX Software Engineering GmbH,      Managing Director: Erika Unter
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-59 Fax: (+49)-8142-66989-80 Email: lukma@denx.de

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^ permalink raw reply	[flat|nested] 9+ messages in thread

end of thread, other threads:[~2024-03-28 13:03 UTC | newest]

Thread overview: 9+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2024-03-28  9:20 Thoughts about U-boot binary size increase Lukasz Majewski
2024-03-28  9:40 ` Marek Vasut
2024-03-28 10:29   ` Lukasz Majewski
2024-03-28 12:18 ` Tom Rini
2024-03-28 12:55   ` Lukasz Majewski
2024-03-28 12:58     ` Tom Rini
2024-03-28 13:03       ` Lukasz Majewski
2024-03-28 12:18 ` Fabio Estevam
2024-03-28 12:52   ` Lukasz Majewski

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