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.section .text._start
.globl _start
.equ UART_DATA, 0
.equ UART_STATUS, 1
.equ UART_RX_READY, 0b10
.equ UART_TX_READY, 0b01
_start:
li a0, 0x1000
loop:
lbu t0, UART_STATUS(a0)
andi t0, t0, UART_RX_READY
beqz t0, loop
lbu t0, UART_DATA(a0)
sb t0, UART_DATA(a0)
j loop
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