Yocto on AMD Zen target ?

Yocto on AMD Zen target ?

[Joel GUITTET]

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Hello,

A customer ask us if it is possible to build a Yocto distro for an AMD EPYC 7502P CPU.
Seems to be a Ryzen Zen architecture according to Wikipedia.

Has Yocto any support for this kind of targets ? I don't find any relevant information.
Is it just supposed to work with the "genericx86-64.conf" machine provided in poky ?

Thanks
Joel

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Re: [yocto] Yocto on AMD Zen target ?

[Khem Raj]

On Fri, Apr 4, 2025 at 1:15 AM Joel GUITTET via lists.yoctoproject.org
<jguittet.opensource=witekio.com@lists.yoctoproject.org> wrote:
>
> Hello,
>
> A customer ask us if it is possible to build a Yocto distro for an AMD EPYC 7502P CPU.
> Seems to be a Ryzen Zen architecture according to Wikipedia.
>
> Has Yocto any support for this kind of targets ? I don't find any relevant information.
> Is it just supposed to work with the "genericx86-64.conf" machine provided in poky ?

Generally yes, if you want specific machine maybe use meta-amd see
https://web.git.yoctoproject.org/meta-amd/tree/meta-amd-bsp/conf/machine
I think milan is the one that you will use for this machine.

>
> Thanks
> Joel
>
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Re: [yocto] Yocto on AMD Zen target ?

[Alexander Kanavin]

On Fri, 4 Apr 2025 at 11:17, Khem Raj via lists.yoctoproject.org
<raj.khem=gmail.com@lists.yoctoproject.org> wrote:
> > A customer ask us if it is possible to build a Yocto distro for an AMD EPYC 7502P CPU.
> > Seems to be a Ryzen Zen architecture according to Wikipedia.
> >
> > Has Yocto any support for this kind of targets ? I don't find any relevant information.
> > Is it just supposed to work with the "genericx86-64.conf" machine provided in poky ?
>
> Generally yes, if you want specific machine maybe use meta-amd see
> https://web.git.yoctoproject.org/meta-amd/tree/meta-amd-bsp/conf/machine
> I think milan is the one that you will use for this machine.

Also, generix86-64 isn't tested on any actual x86 hardware, and lacks
many important tweaks that make a useful image. If meta-amd doesn't
work, there's also meta-intel. X86 builds are broadly compatible
between them.

Alex

Re: [yocto] Yocto on AMD Zen target ?

[Joel GUITTET]

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Hello Khem and Alex,

Thanks for these answers and pointing the meta-amd, I have found the tune-zen include files, seems fine.

Joel

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warn if a variable is not used

[proffesionaladdress2]

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Hello, 

In a .bbappend file, I want to send a warning if a variable is not set/exist and set it to a default value. 
I use BitBake Build Tool Core version 2.0.0. 

If I try to test it like: 

if [[ -z "${MY_VARIABLE}" ]] 

I get an error like: 

Log data follows: 
| DEBUG: Executing shell function do_compile 
| /<path>/run.do_compile.352486: 153: MY_VARIABLE: not found 
| WARNING: exit code 127 from a shell command. 
ERROR: Task (/<path>/rpi-u-boot-scr.bb:do_compile) failed with exit code '1' 

When I use: 
isempty="${@bb.utils.contains('MY_VARIABLE', '', 'false', 'true', d)}" 
bbwarn "isempty=$isempty" 
if [[ $isempty == true ]]; then 
MY_VARIABLE = "value" 
bbwarn "MY_VARIABLE is not defined, used default: ${MY_VARIABLE}" 
else 
bbwarn "?????" 
fi 

it print: 
WARNING: rpi-u-boot-scr-1.0-r0 do_compile: isempty=true 
WARNING: rpi-u-boot-scr-1.0-r0 do_compile: ????? 

I already try with quote or not, but when I test it in a shell by setting the isempty variable it work properly. 

Best regards. 

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warn if a variable is not used

[proffesionaladdress2]

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Hello, 

In a .bbappend file, I want to send a warning if a variable is not set/exist and set it to a default value. 
I use BitBake Build Tool Core version 2.0.0. 

If I try to test it like: 

if [[ -z "${MY_VARIABLE}" ]] 

I get an error like: 

Log data follows: 
| DEBUG: Executing shell function do_compile 
| /<path>/run.do_compile.352486: 153: MY_VARIABLE: not found 
| WARNING: exit code 127 from a shell command. 
ERROR: Task (/<path>/rpi-u-boot-scr.bb:do_compile) failed with exit code '1' 

When I use: 
isempty="${@bb.utils.contains('MY_VARIABLE', '', 'false', 'true', d)}" 
bbwarn "isempty=$isempty" 
if [[ $isempty == true ]]; then 
MY_VARIABLE = "value" 
bbwarn "MY_VARIABLE is not defined, used default: ${MY_VARIABLE}" 
else 
bbwarn "?????" 
fi 

it print: 
WARNING: rpi-u-boot-scr-1.0-r0 do_compile: isempty=true 
WARNING: rpi-u-boot-scr-1.0-r0 do_compile: ????? 

I already try with quote or not, but when I test it in a shell by setting the isempty variable it work properly. 

Best regards. 

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warn if a variable is not used

[proffesionaladdress2]

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Hello, 

In a .bbappend file, I want to send a warning if a variable is not set/exist and set it to a default value. 
I use BitBake Build Tool Core version 2.0.0. 

If I try to test it like: 

if [[ -z "${MY_VARIABLE}" ]] 

I get an error like: 

Log data follows: 
| DEBUG: Executing shell function do_compile 
| /<path>/run.do_compile.352486: 153: MY_VARIABLE: not found 
| WARNING: exit code 127 from a shell command. 
ERROR: Task (/<path>/rpi-u-boot-scr.bb:do_compile) failed with exit code '1' 

When I use: 
isempty="${@bb.utils.contains('MY_VARIABLE', '', 'false', 'true', d)}" 
bbwarn "isempty=$isempty" 
if [[ $isempty == true ]]; then 
MY_VARIABLE = "value" 
bbwarn "MY_VARIABLE is not defined, used default: ${MY_VARIABLE}" 
else 
bbwarn "?????" 
fi 

it print: 
WARNING: rpi-u-boot-scr-1.0-r0 do_compile: isempty=true 
WARNING: rpi-u-boot-scr-1.0-r0 do_compile: ????? 

I already try with quote or not, but when I test it in a shell by setting the isempty variable it work properly. 

Best regards. 

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Re: [yocto] warn if a variable is not used

[Gyorgy Sarvari]

>
> | /<path>/run.do_compile.352486: 153: MY_VARIABLE: not found
<snip>
>            MY_VARIABLE = "value"
Note that when you are in do_compile, that's a shell script. You
shouldn't put space around the equal sign here, because that's not a
valid syntax to assign a value to a variable in shell.

Re: [yocto] warn if a variable is not used

[Gyorgy Sarvari]

You can check what is actually executed by bitbake. Open the
run.do_compile file to see the actual script after a failure, and see
how it is parsed and where it goes astray.

On 4/8/25 15:06, proffesionaladdress2@duck.com wrote:
> Thank you, but branch is never reached because the previous condition is never true in this code (and I don't know why).
> Even if bbwarn print 'WARNING: rpi-u-boot-scr-1.0-r0 do_compile: isempty=true'.
>
> isempty="${@bb.utils.contains('MY_VARIABLE', '', 'false', 'true', d)}"
> bbwarn "isempty=$isempty"
> if [[ $isempty == true ]]; then
>            MY_VARIABLE = "value"
>             bbwarn "MY_VARIABLE is not defined, used default: ${MY_VARIABLE}"
> else
>             bbwarn "?????"
> fi
>
> But maybe bitbake provide some syntax to print a warning when a variable is not set outside bash code.
> Or it is easier to use some python code.
>
> ----- Mail original -----
> De: "Gyorgy Sarvari" <skandigraun_at_gmail.com_proffesionaladdress2@duck.com>
> À: "yocto at lists yoctoproject org proffesionaladdress2" <yocto_at_lists.yoctoproject.org_proffesionaladdress2@duck.com>, proffesionaladdress2@duck.com
> Envoyé: Mardi 8 Avril 2025 14:56:24
> Objet: Re: [yocto] warn if a variable is not used
>
>> | /<path>/run.do_compile.352486: 153: MY_VARIABLE: not found
> <snip>
>>            MY_VARIABLE = "value"
> Note that when you are in do_compile, that's a shell script. You
> shouldn't put space around the equal sign here, because that's not a
> valid syntax to assign a value to a variable in shell.
>

Re: [yocto] warn if a variable is not used

[proffesionaladdress2]

Thank you, but branch is never reached because the previous condition is never true in this code (and I don't know why).
Even if bbwarn print 'WARNING: rpi-u-boot-scr-1.0-r0 do_compile: isempty=true'.

isempty="${@bb.utils.contains('MY_VARIABLE', '', 'false', 'true', d)}"
bbwarn "isempty=$isempty"
if [[ $isempty == true ]]; then
           MY_VARIABLE = "value"
            bbwarn "MY_VARIABLE is not defined, used default: ${MY_VARIABLE}"
else
            bbwarn "?????"
fi

But maybe bitbake provide some syntax to print a warning when a variable is not set outside bash code.
Or it is easier to use some python code.

----- Mail original -----
De: "Gyorgy Sarvari" <skandigraun_at_gmail.com_proffesionaladdress2@duck.com>
À: "yocto at lists yoctoproject org proffesionaladdress2" <yocto_at_lists.yoctoproject.org_proffesionaladdress2@duck.com>, proffesionaladdress2@duck.com
Envoyé: Mardi 8 Avril 2025 14:56:24
Objet: Re: [yocto] warn if a variable is not used

>
> | /<path>/run.do_compile.352486: 153: MY_VARIABLE: not found
<snip>
>            MY_VARIABLE = "value"
Note that when you are in do_compile, that's a shell script. You
shouldn't put space around the equal sign here, because that's not a
valid syntax to assign a value to a variable in shell.

Re: [yocto] warn if a variable is not used

[Quentin Schulz]

Hi,

On 4/8/25 3:12 PM, proffesionaladdress2 via lists.yoctoproject.org wrote:
> Thank you, but branch is never reached because the previous condition is never true in this code (and I don't know why).
> Even if bbwarn print 'WARNING: rpi-u-boot-scr-1.0-r0 do_compile: isempty=true'.
> 
> isempty="${@bb.utils.contains('MY_VARIABLE', '', 'false', 'true', d)}"
> bbwarn "isempty=$isempty"
> if [[ $isempty == true ]]; then

This syntax is not supported by BitBake, please use POSIX condition here 
instead. (i.e. not the [[ ]], but [ ]).

Cheers,
Quentin

Re: [yocto] warn if a variable is not used

[proffesionaladdress2]

Thank you for reply, I also tried the [ ] syntax without success.

I made it like following, but it print a lot of warning with BitBake Build Tool Core version 2.0.0 (the ":=" doesn't expand once in .bb file?).
In a check_variable.bbclass:

# warn_and_set_variable_default function take as parameters, the BitBake datastore "d", the variable to check "var" and the value to set if the variable "var" is empty.
# It shall be set to a variable like: MY_VAR := "${@warn_and_set_variable_default(d, 'MY_VAR', "default")}"
# to avoid multiple variable expansion according to bitbake documentation:
# https://docs.yoctoproject.org/bitbake/bitbake-user-manual/bitbake-user-manual-metadata.html#inline-python-variable-expansion
def warn_and_set_variable_default(d, var, defaultvalue):
    variable_value = d.getVar(var)
    if not variable_value:
        bb.warn('The variable %s is empty or not defined, it will be set to "%s"' % (var, defaultvalue))
        return defaultvalue
    else:
        return variable_value

# fail_if_variable_empty function take as parameters, the BitBake datastore "d", the variable to check "var".
# It shall be set to a variable like warn_and_set_variable_default function.
def fail_if_variable_empty(d, var):
    variable_value = d.getVar(var)
    if not variable_value:
        bb.fatal('The variable %s is empty and shall be set' %var)
        return None
    else:
        return variable_value




Then in recipe:

include classes/check_variable.bbclass

# Parse mandatory variables
MY_VAR_MANDATORY_PARSED := "${@fail_if_variable_empty(d, 'MY_VAR_MANDATORY')}"

# Parse optional variables
MY_VAR_OPTIONAL_PARSED := "${@warn_and_set_variable_default(d, 'MY_VAR_OPTIONAL', 'default')}"


#usage
do_install:append() {
      sed -i "s#@MY_VAR_MANDATORY@#\"${MY_VAR_MANDATORY_PARSED}\"#g" ${D}${bindir}/myfile.file
      sed -i "s#@MY_VAR_OPTIONAL@#\"${MY_VAR_OPTIONAL_PARSED}\"#g" ${D}${bindir}/myfile.file
}

And in local.conf (to avoid error from bbfatal):

MY_VAR_MANDATORY="deadbeef"


it will print 14 times for my recipe, like:
WARNING: The variable MY_VAR_OPTIONAL is empty or not defined, it will be set to "default"
WARNING: The variable MY_VAR_OPTIONAL is empty or not defined, it will be set to "default"
WARNING: The variable MY_VAR_OPTIONAL is empty or not defined, it will be set to "default"
WARNING: The variable MY_VAR_OPTIONAL is empty or not defined, it will be set to "default"
WARNING: The variable MY_VAR_OPTIONAL is empty or not defined, it will be set to "default"
WARNING: The variable MY_VAR_OPTIONAL is empty or not defined, it will be set to "default"
WARNING: The variable MY_VAR_OPTIONAL is empty or not defined, it will be set to "default"
WARNING: The variable MY_VAR_OPTIONAL is empty or not defined, it will be set to "default"
WARNING: The variable MY_VAR_OPTIONAL is empty or not defined, it will be set to "default"
WARNING: The variable MY_VAR_OPTIONAL is empty or not defined, it will be set to "default"
WARNING: The variable MY_VAR_OPTIONAL is empty or not defined, it will be set to "default"
WARNING: The variable MY_VAR_OPTIONAL is empty or not defined, it will be set to "default"
WARNING: The variable MY_VAR_OPTIONAL is empty or not defined, it will be set to "default"
WARNING: The variable MY_VAR_OPTIONAL is empty or not defined, it will be set to "default"

----- Mail original -----
De: "Quentin Schulz" <quentin.schulz_at_cherry.de_proffesionaladdress2@duck.com>
À: "yocto at lists yoctoproject org proffesionaladdress2" <yocto_at_lists.yoctoproject.org_proffesionaladdress2@duck.com>, "proffesionaladdress2" <proffesionaladdress2@duck.com>, "Gyorgy Sarvari" <skandigraun_at_gmail.com_proffesionaladdress2@duck.com>
Envoyé: Lundi 14 Avril 2025 12:58:57
Objet: Re: [yocto] warn if a variable is not used

Hi,

On 4/8/25 3:12 PM, proffesionaladdress2 via lists.yoctoproject.org wrote:
> Thank you, but branch is never reached because the previous condition is never true in this code (and I don't know why).
> Even if bbwarn print 'WARNING: rpi-u-boot-scr-1.0-r0 do_compile: isempty=true'.
> 
> isempty="${@bb.utils.contains('MY_VARIABLE', '', 'false', 'true', d)}"
> bbwarn "isempty=$isempty"
> if [[ $isempty == true ]]; then

This syntax is not supported by BitBake, please use POSIX condition here 
instead. (i.e. not the [[ ]], but [ ]).

Cheers,
Quentin

Re: [yocto] warn if a variable is not used

[Clayton Casciato]

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In case you weren't aware, you can explicitly set default values:
W ??= "x"
A ?= "aval"

https://docs.yoctoproject.org/bitbake/2.0/bitbake-user-manual/bitbake-user-manual-metadata.html#setting-a-default-value

--

Variables can be queried as to how they are set:
$ bitbake-getvar --recipe rpi-u-boot-scr MY_VARIABLE

--

Also note:

> 
> The scripts are executed by /bin/sh , which may not be a bash shell but
> might be something such as dash.
> 

https://docs.yoctoproject.org/bitbake/2.0/bitbake-user-manual/bitbake-user-manual-metadata.html#shell-functions

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Re: [yocto] warn if a variable is not used

[proffesionaladdress2]

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Thank you, I wasn't aware about the --recipe option of bitbake-getvar. 

The goal here is not to silently set to a value but to also send a warning. 

I made it like but it print a lot of warning with BitBake Build Tool Core version 2.0.0 (the ":=" doesn't expand once in .bb file?), in a check_variable.bbclass: 

# warn_and_set_variable_default function take as parameters, the BitBake datastore "d", the variable to check "var" and the value to set if the variable "var" is empty. 
# It shall be set to a variable like: MY_VAR := "${@warn_and_set_variable_default(d, 'MY_VAR', "default")}" 
# to avoid multiple variable expansion according to bitbake documentation: 
# https://docs.yoctoproject.org/bitbake/bitbake-user-manual/bitbake-user-manual-metadata.html#inline-python-variable-expansion 
def warn_and_set_variable_default(d, var, defaultvalue): 
variable_value = d.getVar(var) 
if not variable_value: 
bb.warn('The variable %s is empty or not defined, it will be set to "%s"' % (var, defaultvalue)) 
return defaultvalue 
else: 
return variable_value 

# fail_if_variable_empty function take as parameters, the BitBake datastore "d", the variable to check "var". 
# It shall be set to a variable like warn_and_set_variable_default function. 
def fail_if_variable_empty(d, var): 
variable_value = d.getVar(var) 
if not variable_value: 
bb.fatal('The variable %s is empty and shall be set' %var) 
return None 
else: 
return variable_value 




Then in recipe: 

include classes/check_variable.bbclass 

# Parse mandatory variables 
MY_VAR_MANDATORY_PARSED := "${@fail_if_variable_empty(d, 'MY_VAR_MANDATORY')}" 

# Parse optional variables 
MY_VAR_OPTIONAL_PARSED := "${@warn_and_set_variable_default(d, 'MY_VAR_OPTIONAL', 'default')}" 


#usage 
do_install:append() { 
sed -i "s#@MY_VAR_MANDATORY@#\"${MY_VAR_MANDATORY_PARSED}\"#g" ${D}${bindir}/myfile.file 
sed -i "s#@MY_VAR_OPTIONAL@#\"${MY_VAR_OPTIONAL_PARSED}\"#g" ${D}${bindir}/myfile.file 
} 

And in local.conf (to avoid error from bbfatal): 

MY_VAR_MANDATORY="deadbeef" 


it will print 14 times for my recipe, like: 
WARNING: The variable MY_VAR_OPTIONAL is empty or not defined, it will be set to "default" 
WARNING: The variable MY_VAR_OPTIONAL is empty or not defined, it will be set to "default" 
WARNING: The variable MY_VAR_OPTIONAL is empty or not defined, it will be set to "default" 
WARNING: The variable MY_VAR_OPTIONAL is empty or not defined, it will be set to "default" 
WARNING: The variable MY_VAR_OPTIONAL is empty or not defined, it will be set to "default" 
WARNING: The variable MY_VAR_OPTIONAL is empty or not defined, it will be set to "default" 
WARNING: The variable MY_VAR_OPTIONAL is empty or not defined, it will be set to "default" 
WARNING: The variable MY_VAR_OPTIONAL is empty or not defined, it will be set to "default" 
WARNING: The variable MY_VAR_OPTIONAL is empty or not defined, it will be set to "default" 
WARNING: The variable MY_VAR_OPTIONAL is empty or not defined, it will be set to "default" 
WARNING: The variable MY_VAR_OPTIONAL is empty or not defined, it will be set to "default" 
WARNING: The variable MY_VAR_OPTIONAL is empty or not defined, it will be set to "default" 
WARNING: The variable MY_VAR_OPTIONAL is empty or not defined, it will be set to "default" 
WARNING: The variable MY_VAR_OPTIONAL is empty or not defined, it will be set to "default" 



De: "Clayton Casciato" <ccasciato_at_21sw.us_proffesionaladdress2@duck.com> 
À: "proffesionaladdress2" <proffesionaladdress2@duck.com>, "yocto at lists yoctoproject org proffesionaladdress2" <yocto_at_lists.yoctoproject.org_proffesionaladdress2@duck.com> 
Envoyé: Mardi 8 Avril 2025 15:18:54 
Objet: Re: [yocto] warn if a variable is not used 

In case you weren't aware, you can explicitly set default values: W ??= "x" A ?= "aval" https://docs.yoctoproject.org/bitbake/2.0/bitbake-user-manual/bitbake-user-manual-metadata.html#setting-a-defaul 

	

	

	

	
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In case you weren't aware, you can explicitly set default values: 
W ??= "x" 
A ?= "aval" 
https://docs.yoctoproject.org/bitbake/2.0/bitbake-user-manual/bitbake-user-manual-metadata.html#setting-a-default-value 
-- 
Variables can be queried as to how they are set: 
$ bitbake-getvar --recipe rpi-u-boot-scr MY_VARIABLE 
-- 
Also note: 



The scripts are executed by /bin/sh , which may not be a bash shell but might be something such as dash . 



https://docs.yoctoproject.org/bitbake/2.0/bitbake-user-manual/bitbake-user-manual-metadata.html#shell-functions 



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