One of the most annoying missing features of the HiKey ARM54 board is the lack of a proper UART connection, to enable the same degree of boot information as other SoC systems.. There is a 4-pin/hole connection point, but no actual connector… So, I had to get out the (mini) soldering iron, and magnifying goggles, and use a not-so-steady hand..
I managed to solder on three pin-type connectors, cut from a strip of a dozen or so, and then use female push-on connectors to the 1.8v USB/UART tail..
After this, I got a proper boot / console display (on /dev/ttyAMA0):
........ debug EMMC boot: print init OK debug EMMC boot: send RST_N . debug EMMC boot: start eMMC boot...... load fastboot1! #PMU LDO15_REG_ADJ:0x00000054, STATUS3_LDO9_16:0x00000048 #PMU LDO22_REG:ADJ:0x00000057, STATUS4_LDO17_22:0x00000026 [BDID]boardid: 777 <7.7.7> #select_hw_config, 58, board_id:0x0000002b #select_hw_config, 71, array index:0 baudRate=115200, g_baudRate=115200 get_hw_config_int,hw_afreq:1200000. get_efuse_value,efuse ATE_flag temp:0x02800000. ATE PASS,ate flag value:0x00000001. get_efuse_value,efuse acpu_freq change level:0xb6baeb00. get_efuse_value,efuse afreq change level val:0x00000000. get_efuse_value,efuse acpu_freq level:0xb6baeb00. get_efuse_value,efuse acpu freq sys level:0x00000000. ###INFO###,soc_freq = hw_afreq, efuse_afreq:1200000,hw_afreq:1200000. efuse ACPU 1.4G HPM:0. efuse ACPU 1.2G HPM:0. efuse ACPU 960M HPM:0. fastboot: acpu_dvfs_init successful! acpu_get_dvfs_volt,g_afreq_max_pro is :5▒▒acpu max freq:1200000. acpu support freq num:5 volt:0x0000003a 0x0000003a 0x0000004a 0x0000005b 0x0000006b acpu start prof:0x00000004 acpu magic:0x5a5ac5c5 #### success !!!!! set_acpu_freq: acpu support freq num is 5 and start is 4 . get_ddr_type 1; (lpddr2: 0; lpddr3: 1) ddr_init(): get_ddr_type: 1 ddr freq: 800000 in lpddr3_init: mode: 0; freq_config: 800 ...... etc.......
This is (IMHO) essential for proper development and testing, especially as this device (unlike the DragonBoard 410c) has a version of U-Boot available, and also supports UEFI.. https://github.com/96boards/documentation/wiki/HiKeyUEFI
So far, I have not been able to get a newer compiled Kernel to boot, but this UART console connection will help to get things working….
Robert Gadsdon. July 11, 2015.