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AM625: Disabling CPU in device tree doesn't work

Alexis LOGNON
Intellectual 640 points

Part Number: AM625

Hello,

I need to disable cpus as explain the  TI Linux Academy example:

https://dev.ti.com/tirex/explore/node?node=A__AGMop5fjikXYw819LJNi-w__linux_academy_am62x__XaWts8R__LATEST

I added the following lines in k3-am625-sk.dts in the Linux device tree.

cpus {
                /delete-node/ cpu@1;
                /delete-node/ cpu@2;
                /delete-node/ cpu@3;
};

But I got then error below : 

|   DTC     arch/arm64/boot/dts/ti/k3-am625-sk.dtb
| Error: /workspace/sitara/tisdk/build/arago-tmp-external-arm-glibc/work-shared/am62xx-evm/kernel-source/arch/arm64/boot/dts/ti/k3-am625-sk.dts:35.1-5 syntax error
| FATAL ERROR: Unable to parse input tree
| scripts/Makefile.lib:328: recipe for target 'arch/arm64/boot/dts/ti/k3-am625-sk.dtb' failed
| make[2]: *** [arch/arm64/boot/dts/ti/k3-am625-sk.dtb] Error 1
| /workspace/sitara/tisdk/build/arago-tmp-external-arm-glibc/work-shared/am62xx-evm/kernel-source/Makefile:1365: recipe for target 'ti/k3-am625-sk.dtb' failed
| make[1]: *** [ti/k3-am625-sk.dtb] Error 2
| /workspace/sitara/tisdk/build/arago-tmp-external-arm-glibc/work-shared/am62xx-evm/kernel-source/Makefile:185: recipe for target '__sub-make' failed
| make: *** [__sub-make] Error 2
| ERROR: oe_runmake failed
| WARNING: /workspace/sitara/tisdk/build/arago-tmp-external-arm-glibc/work/am62xx_evm-linux/linux-ti-staging/5.10.140+gitAUTOINC+5e63ae91b2-r0b.arago5/temp/run.do_compile.1044445:1 exit 1 from 'exit 1'
| ERROR: Execution of '/workspace/sitara/tisdk/build/arago-tmp-external-arm-glibc/work/am62xx_evm-linux/linux-ti-staging/5.10.140+gitAUTOINC+5e63ae91b2-r0b.arago5/temp/run.do_compile.1044445' failed with exit code 1
ERROR: Task (/workspace/sitara/tisdk/sources/meta-ti/recipes-kernel/linux/linux-ti-staging_5.10.bb:do_compile) failed with exit code '1'

Regards,

Alexis.

  • 0
    TI__Guru**** 175531 points

    Hi Alexis,

    Please use the following kernel patch:

    diff --git a/arch/arm64/boot/dts/ti/k3-am625-sk.dts b/arch/arm64/boot/dts/ti/k3-am625-sk.dts
index 4b9661f1adef..ad7f7c619fa3 100644
--- a/arch/arm64/boot/dts/ti/k3-am625-sk.dts
+++ b/arch/arm64/boot/dts/ti/k3-am625-sk.dts
@@ -48,6 +48,19 @@ opp-1400000000 {
                        clock-latency-ns = <6000000>;
                };
        };
+
+       cpus {
+               cpu-map {
+                       cluster0 {
+                               /delete-node/ core1;
+                               /delete-node/ core2;
+                               /delete-node/ core3;
+                       };
+               };
+               /delete-node/ cpu@1;
+               /delete-node/ cpu@2;
+               /delete-node/ cpu@3;
+       };
 };