Hello,
We noticed a difference between PetaLinux 2022.2 and meta-xilinx. When using
petalinux-package to create a boot image for ZynqMP, it seems that the .bif
that is generated uses the CBR method of loading PMU FW, as described here:
https://docs.xilinx.com/r/en-US/ug1137-zynq-ultrascale-mpsoc-swdev/PMU-Firmware-Loading-Options.
Contrast this to meta-xilinx (2022.2) which uses the FSBL method. We noticed
that when building BOOT.BIN using PetaLinux, everything works fine. When using
Yocto, we end up with PS_ERROR_OUT asserting and our red LED turning on. (This
is a custom board).
I used a JTAG to check the source of the error when booting using the
Yocto-built BOOT.BIN. The output is below:
xsct% rrd pmu_global
global_cntrl: 00018812 ps_cntrl: 00000000
apu_pwr_status_init: 00000000 mem_cntrl: 00bb02cb
addr_error_status: 00000000 addr_error_int_mask: 00000001
addr_error_int_en addr_error_int_dis
global_gen_storage0: 00000000 global_gen_storage1: 00000000
global_gen_storage2: 00000000 global_gen_storage3: 00000000
global_gen_storage4: 00000006 global_gen_storage5: 00020003
global_gen_storage6: fffe9e00 pers_glob_gen_storage0: 00000000
pers_glob_gen_storage1: 00000000 pers_glob_gen_storage2: 00000000
pers_glob_gen_storage3: 00000000 pers_glob_gen_storage4: 00000000
pers_glob_gen_storage5: 00000000 pers_glob_gen_storage6: 00000000
pers_glob_gen_storage7: 00000000 ddr_cntrl: 00
pwr_state: 00ff008f aux_pwr_state: 000f0080
ram_ret_cntrl: 00000000 pwr_supply_status: 00000007
req_pwrup_status: 00000000 req_pwrup_int_mask: 00fff4bf
req_pwrup_int_en req_pwrup_int_dis
req_pwrup_trig req_pwrdwn_status: 00000000
req_pwrdwn_int_mask: 00fff4bf req_pwrdwn_int_en
req_pwrdwn_int_dis req_pwrdwn_trig
req_iso_status: 00000000 req_iso_int_mask: 00000017
req_iso_int_en req_iso_int_dis
req_iso_trig req_swrst_status: 00000000
req_swrst_int_mask: fbf717df req_swrst_int_en
req_swrst_int_dis req_swrst_trig
csu_br_error: 00009191 mb_fault_status: 00000000
error_status_1: 00000000 error_int_mask_1: ffff32ff
error_int_en_1 error_int_dis_1
error_status_2: 01000000 error_int_mask_2: 073f1f3f
error_int_en_2 error_int_dis_2
error_por_mask_1: ffff32ff error_por_en_1
error_por_dis_1 error_por_mask_2: 073f1f3f
error_por_en_2 error_por_dis_2
error_srst_mask_1: ffff32ff error_srst_en_1
error_srst_dis_1 error_srst_mask_2: 073f1f3f
error_srst_en_2 error_srst_dis_2
error_sig_mask_1: 000000c3 error_sig_en_1
error_sig_dis_1 error_sig_mask_2: 00001600
error_sig_en_2 error_sig_dis_2
error_en_1: 00000000 error_en_2: 073e0000
aib_cntrl aib_status: 00000000
global_reset: 00000000 rom_validation_status: 00000003
rom_validation_digest_0: 1b7d32b9 rom_validation_digest_1: e1455513
rom_validation_digest_2: 549e6276 rom_validation_digest_3: 12e0c00e
rom_validation_digest_4: a80ab074 rom_validation_digest_5: 31c67e12
rom_validation_digest_6: eb4f93c2 rom_validation_digest_7: daecec5e
rom_validation_digest_8: 1409d274 rom_validation_digest_9: a7cf9780
rom_validation_digest_10: 952a6364 rom_validation_digest_11: 97aaedc8
safety_gate: 00000006 mbist_rst: 00000000
mbist_pg_en: 00000000 mbist_setup: 00000000
mbist_done: 00000000 mbist_good: 00000000
safety_chk: 00000000
xsct% mrd 0xFFD80530
FFD80530: 00000000
xsct% mrd 0xFFD80540
FFD80540: 01000000
>From the register reference
>(https://docs.xilinx.com/r/en-US/ug1087-zynq-ultrascale-registers/ERROR_STATUS_2-PMU_GLOBAL-Register),
> this last line means that it is a PMU_SERVICE error. Some online forums
>suggest it could be an issue with power sequencing. But if that's the case, I
>don't understand why it doesn't occur with the PetaLinux-built BOOT.BIN.
I locally patched meta-xilinx to use the CBR method for PMU FW loading and
confirmed that PS_ERROR_OUT is not asserted. So for us it is a simple fix, but
I'd really like to figure out why before just committing the change.
I have a few questions:
1. Is there a reason why PetaLinux uses the CBR method, while meta-xilinx
uses the FSBL method?
2. Can anyone explain why we would see the PMU_SERVICE issue when using FSBL
method, but not CBR method?
3. Would layer maintainers accept a patch that adds the CBR method for
loading PMU FW?
Thanks,
Chris
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