I tried but that did not work. The device successfully passed DHCP, downloaded the file via TFTP, but I was never able to reach it on the OWRT default IP. Have no serial access yet, so cant confirm what went wrong.
FYI,this is a hAP ac³ LTE6 kit version but as to my knowledge it is exactly the same as the hAP ac³ plus a mini-PCI port. So theoretically it should boot with the hAP ac³ initramfs image.
MOD: after adding serial, this is what I see:
Format: Log Type - Time(microsec) - Message - Optional Info
Log Type: B - Since Boot(Power On Reset), D - Delta, S - Statistic
S - QC_IMAGE_VERSION_STRING=BOOT.BF.3.1.1-00096
S - IMAGE_VARIANT_STRING=DAABANAZA
S - OEM_IMAGE_VERSION_STRING=CRM
S - Boot Config, 0x00000021
S - Core 0 Frequency, 0 MHz
B - 262 - PBL, Start
B - 1341 - bootable_media_detect_entry, Start
B - 1682 - bootable_media_detect_success, Start
B - 1697 - elf_loader_entry, Start
B - 5104 - auth_hash_seg_entry, Start
B - 7269 - auth_hash_seg_exit, Start
B - 577861 - elf_segs_hash_verify_entry, Start
B - 694158 - PBL, End
B - 694183 - SBL1, Start
B - 782768 - pm_device_init, Start
D - 6 - pm_device_init, Delta
B - 784289 - boot_flash_init, Start
D - 45976 - boot_flash_init, Delta
B - 834463 - boot_config_data_table_init, Start
D - 3864 - boot_config_data_table_init, Delta - (419 Bytes)
B - 841647 - clock_init, Start
D - 7561 - clock_init, Delta
B - 853733 - CDT version:2,Platform ID:8,Major ID:1,Minor ID:0,Subtype:0
B - 857221 - sbl1_ddr_set_params, Start
B - 862207 - cpr_init, Start
D - 2 - cpr_init, Delta
B - 866699 - Pre_DDR_clock_init, Start
D - 4 - Pre_DDR_clock_init, Delta
D - 13147 - sbl1_ddr_set_params, Delta
B - 879977 - pm_driver_init, Start
D - 2 - pm_driver_init, Delta
B - 951827 - sbl1_wait_for_ddr_training, Start
D - 30 - sbl1_wait_for_ddr_training, Delta
B - 967591 - Image Load, Start
D - 143575 - QSEE Image Loaded, Delta - (267732 Bytes)
B - 1111668 - Image Load, Start
D - 1445 - SEC Image Loaded, Delta - (2048 Bytes)
B - 1121955 - Image Load, Start
D - 16696 - APPSBL Image Loaded, Delta - (29260 Bytes)
B - 1139070 - QSEE Execution, Start
D - 58 - QSEE Execution, Delta
B - 1145198 - SBL1, End
D - 453125 - SBL1, Delta
S - Flash Throughput, 1853 KB/s (299459 Bytes, 161589 us)
S - DDR Frequency, 672 MHz
Event when the TFTP upload of the initramfs file is done, nothing changes on the serial output.
MOD2: after changing the boot order from try-nand_then_ethernet
to try_ethernet_then_nand
the unit booted to initramfs successfully.
Next question is if I can just sysupgrade the unit? this is the mtd table:
root@OpenWrt:/tmp# cat /proc/mtd
dev: size erasesize name
mtd0: 00080000 00010000 "Qualcomm"
mtd1: 00080000 00010000 "RouterBoot"
mtd2: 00002000 00010000 "hard_config"
mtd3: 00007e24 00010000 "dtb_config"
mtd4: 00001000 00010000 "soft_config"