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This is a randomly powerpc issue for a long time, probably it is related to powerpc firmware.

Use the followed OFW commands manually to workaround this issue

0 > SET_NVRAM_DEFAULTS 
 SMS Macro Operation Succeeded.
 ok
0 > RESET_PARTITION 
Rebooting...

Then nessberry LPAR2 is able to PXE boot into grub successfully

okurz wrote in #note-4:

@rfan1 can it be that the agama test scenario is missing some special test code to call SET_NVRAM_DEFAULTS which other test code already has?

The answer is no, the agama tests use the same net boot process as other sle products. [nbp file, grub.cfg]. the difference is loading different kernel/initrd files to start the installation.

But, I can see below code

    # Restore LPAR's NVRAM defaults if SET_NVRAM_DEFAULTS setting is present
    if (get_var('SET_NVRAM_DEFAULTS')) {
        # Boot into open firmware (of) first to issue a SET_NVRAM_DEFAULTS command
        enter_cmd("chsysstate -r lpar -m $hmc_machine_name -o on -b of --id $lpar_id ");
        enter_cmd("mkvterm -m $hmc_machine_name --id $lpar_id");
        assert_screen 'openfirmware-prompt', 60;
        enter_cmd('SET_NVRAM_DEFAULTS');
        assert_screen 'openfirmware-prompt';
        # Exit from LPAR's console, shutdown LPAR and continue as usual
        enter_cmd('~~.');
        assert_screen 'terminate-openfirmware-session';
        send_key 'y';
        assert_screen 'powerhmc-ssh', 60;
        enter_cmd("chsysstate -r lpar -m $hmc_machine_name -o shutdown --immed --id $lpar_id ");
        check_lpar_is_down($hmc_machine_name, $lpar_id);
    }

Let me try if it can help.

Seems the issue is gone with or without the parameter SET_NVRAM_DEFAULTS
http://openqa.suse.de/tests/overview?distri=sle&version=16.0&build=rfan1223_2

Let me monitor it in next few days :)