HTC Desire 820 Single SIM (htc-a51tuhl)

HTC Desire 820 (Single SIM)
Manufacturer	HTC
Name	Desire 820 (Single SIM)
Codename	htc-a51tuhl
Released	2014
Type	handset
Hardware
Chipset	Qualcomm Snapdragon 615 (MSM8939)
CPU	4x 1.5GHz Cortex-A53 + 4x 1.0GHz Cortex-A53
GPU	Adreno 405
Display	720x1280 SLCD
Storage	16 GB
Memory	2 GB
Architecture	aarch64
Software
Original software	Android
Original version	4.4
postmarketOS
Category	testing
Pre-built images	no
Mainline	yes

Contributors

Natsu

Users owning this device

Natsu (Notes: Battery Broken & S-on)
Rom4nik

How to enter flash mode

In Power off state, use Volume- & power key to enter Hboot, and directly select the fastboot interface.

for fastboot boot requirement, need dts matched by following:

INFO[435302364] [DEBUG] Board pid:379, pcbid:0x80, soc version:0 INFOx10000

Seems this fastboot interface can't use general fastboot for flashing partition, need to use another method to flash.

Installation

"The device must as S-OFF mode for installing custom kernel!"

For S-ON device, maybe recovery partition install lk2nd and boot to lk2nd can ignore the hboot limitation and can modify the system partition. (in recovery it'll always read-only.)

UART

Ground

You can connect to the ground by soldering to the pin shown in picture above or just using some part of the motherboard's ground plane, e.g. a screw hole or the large copper shielding.

TX

The picture above shows the motherboard's UART TX pin. Be aware that high level (logical 1) is 1.8 V.

Log

After holding power button down for 2 seconds, the motherboard transmits the following data:

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.3.0-00276
S - IMAGE_VARIANT_STRING=SAAAANAZA
S - OEM_IMAGE_VERSION_STRING=jenkins.git.htc.com
S - Boot Config, 0x000000e5
S - Core 0 Frequency, 0 MHz
B -      1589 - PBL, Start
B -      3621 - bootable_media_detect_entry, Start
B -    781651 - bootable_media_detect_success, Start
B -    781657 - elf_loader_entry, Start
B -    782956 - auth_hash_seg_entry, Start
B -    822238 - auth_hash_seg_exit, Start
B -    844562 - elf_segs_hash_verify_entry, Start
B -    930776 - PBL, End
B -    938485 - SBL1, Start
SBL1 abnormal reset magic = 0xffffffff
[DEBUG][SBL1] sbl1_hw_init: PM device init
B -   1008757 - pm_device_init, Start
D -     14640 - pm_device_init, Delta
[DEBUG][SBL1] sbl1_hw_init: Check device temperature
[INFO][SBL1] sbl1_hw_init: SBL1 hw init done
B -   1034194 - boot_flash_init, Start
D -         0 - boot_flash_init, Delta
[INFO][SBL1] sbl1_load_htc_extra: sbl1_load_htc_extra PID: 342, PCBID: 128
[INFO][SBL1] sbl1_load_htc_extra: sbl1_load_htc_extra Is ramdump: 0
[INFO][SBL1] sbl1_load_htc_extra: sbl1_load_htc_extra Security info: 3 
[INFO][SBL1] sbl1_load_htc_extra: sbl1_load_htc_extra User Trial flag: 0 
[INFO][SBL1] sbl1_load_htc_extra: sbl1_load_htc_extra JTAG disable flag: 1 
[INFO][SBL1] sbl1_load_htc_extra: sbl1_load_htc_extra JTAG reenable flag: 0 
[DEBUG][SBL1] sbl1_htc_init: radio_flag: 0x59EC9324, reset_reason: 0xD3D631DF
B -   1120326 - boot_config_data_table_init, Start
D -        30 - boot_config_data_table_init, Delta - (0 Bytes)
B -   1130360 - CDT version:3,Platform ID:1,Major ID:1,Minor ID:0,Subtype:0
B -   1137040 - sbl1_ddr_set_params, Start
B -   1143353 - cpr_init, Start
D -      4361 - cpr_init, Delta
B -   1147867 - Pre_DDR_clock_init, Start
D -       274 - Pre_DDR_clock_init, Delta
D -         0 - sbl1_ddr_set_params, Delta
[SBL1] Detected DDR Info: interface 0
[SBL1] Manufacture_name: -16340474
[SBL1] CS0 Row/Col/Bank: 15/10/8
[SBL1] CS1 Row/Col/Bank: 15/10/8
[SBL1] Detected DDR Info: interface 1
[SBL1] Manufacture_name: 0
[SBL1] CS0 Row/Col/Bank: 0/0/0
[SBL1] CS1 Row/Col/Bank: 0/0/0
B -   1187853 - pm_driver_init, Start
[INFO][SBL1][BATT] pm_chg_is_battery_weak: batt_vol: 3741mV, sbl_bootup_threshold: 3400mV, err: 0
D -     10797 - pm_driver_init, Delta
B -   1212344 - clock_init, Start
D -       122 - clock_init, Delta
[INFO][SBL1] preserve_rpm_ram_data: Not in ramdump mode, skip to preserve RPM RAM
[INFO][SBL1] preserve_smem_data: Not in ramdump mode, skip to preserve SHARE RAM
[INFO][SBL1] preserve_qsee_code: Not in ramdump mode, skip to preserve QSEE CODE
[INFO][SBL1] boot_config_process_entry: Loading QSEE...
B -   1246077 - Image Load, Start
[INFO][SBL1] boot_auth_image: Image 7 signature verify pass
D -     54565 - QSEE Image Loaded, Delta - (506312 Bytes)
[INFO][SBL1] security_set_emmc_write_protection: [security] s-on check
[INFO][SBL1] set_power_on_write_protection: [security] write protect on
B -   1321382 - Image Load, Start
D -        61 - SEC Image Loaded, Delta - (0 Bytes)
B -   1328671 - sbl1_efs_handle_cookies, Start
D -       213 - sbl1_efs_handle_cookies, Delta
[INFO][SBL1] boot_config_process_entry: Loading QHEE...
B -   1342274 - Image Load, Start
[INFO][SBL1] boot_auth_image: Image 21 signature verify pass
D -     41602 - QHEE Image Loaded, Delta - (68336 Bytes)
[INFO][SBL1] boot_config_process_entry: Loading RPM...
B -   1390769 - Image Load, Start
[INFO][SBL1] boot_auth_image: Image 10 signature verify pass
D -     42609 - RPM Image Loaded, Delta - (156028 Bytes)
[INFO][SBL1] boot_config_process_entry: Loading APPSBL...
B -   1438014 - Image Load, Start
[DEBUG][SBL1] boot_auth_image: PID: 342
[INFO][SBL1] boot_auth_image: SHIP RSA verify Success for type: 9
[INFO][SBL1] boot_auth_image: Image 9 signature verify pass
D -    593377 - APPSBL Image Loaded, Delta - (2096384 Bytes)
B -   2036790 - QSEE Execution, Start
D -        91 - QSEE Execution, Delta
B -   2043469 - SBL1, End
D -   1107241 - SBL1, Delta
S - Flash Throughput, 58000 KB/s  (2854140 Bytes,  48403 us)
S - DDR Frequency, 796 MHz
security_level 3
jtag_disable_flag 1
jtag_reenable_flag 0
pid 342
pcbid 128
enter_boot_dload_flag 0
engineerid 0
fuse is blown
TZ 3.02.A64.02 342-3-1-0-0 #P:ok