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DS90UB921-Q1: reg 0xC4 change

Part Number: DS90UB921-Q1

Hi team,

customer use 921/948, found some boards will be flash and LOCK is nor stable. they read 921 reg found the reg 0xC4/C5/C6/C7 are difference,

for noraml display, 0xC4=78; 0xC5=00; 0xC6=00; 0xC7=60

for flash, 0xC4=48; 0xC5=08; 0xC6=00;0xC7=00

we can't find the details about these reg, what are they use for? thanks.

below is flash reg value:

0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f    0123456789abcdef

00: 18 00 00 fa 80 00 68 40 40 00 00 00 05 00 00 00    ?..??.h@@...?...

10: 00 00 00 10 00 00 fe 5e a1 a5 00 00 00 00 00 00    ...?..?^??......

20: 00 00 25 00 00 00 00 00 00 24 00 a0 00 00 00 00    ..%......$.?....

30: 03 10 00 00 00 00 08 34 00 0a 20 21 00 00 f0 00    ??....?4.? !..?.

40: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................

50: 20 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00     ...............

60: 00 00 00 00 10 00 00 00 00 00 00 00 00 00 00 00    ....?...........

70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................

80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................

90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................

a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................

b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................

c0: 00 00 80 00 48 08 00 00 40 00 00 00 00 00 00 00    ..?.H?..@.......

d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................

e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................

f0: 5f 55 42 39 32 31 00 00 00 00 00 00 00 00 00 00    _UB921..........