usbloadergx/source/Channels/chan_stub.s

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#define STUB 0x3400
.text
.section .text
.globl _unstub_start
_unstub_start:
isync
// set MSR[DR:IR] = 00, jump to STUB
lis 3,STUB@h
ori 3,3,STUB@l
mtsrr0 3
mfmsr 3
li 4,0x30
andc 3,3,4
mtsrr1 3
rfi