A ZTE B700V7-2017 user (OFTC IRC nick: arzamas-16[m]) reported that it mangled UART logs:
.......................................................................................set vcck to 1200 mv set vddee to 1200 mv <U-Boot logs>
They successfully dumped BL1. We (FerassElHafidi and arzamas-16) fed the dump into Ghidra:
1 /* WARNING: Globals starting with '_' overlap smaller symbols at the same address */
2
3 uint serial_putc(uint c)
4
5 {
6 byte *efuse_data;
7
8 /* Thanks to arzamas-16[m] for helping! */
9 efuse_data = (byte *)get_efuse_mirror_ptr();
10 if ((efuse_data[5] >> 1 & 1) != 0) {
11 c = L'.';
12 }
13 do {
14 } while ((_DAT_c81004cc >> 0x15 & 1) != 0);
15 _DAT_c81004c0 = c & 0xff;
16 return c;
17 }
It's known to happen on:
ZTE B700V7
- ZTE ZXV10 B860H V5