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bl808 note

for sipeed m1s

d0 jtag

simple enable d0 jtag in uboot:

# bootup d0
rproc start 0
# config gpio use for jtag d0
mw 0x200008C4 0x80401B03
mw 0x200008C8 0x80401B03
mw 0x200008CC 0x80401B03
mw 0x200008D0 0x80401B03