initialize JTAG register in boot.S

gistfile1.txt

	// initialize gpio
	bl	init_gpio

	// pinMode(22 ,ALT4)
	ldr	r3, .L2
	ldr	r2, .L2
	ldr	r2, [r2]
	orr	r2, r2, #192
	str     r2, [r3]

	// pinMode(4, ALT5)
	ldr	r3, .L2+4
	ldr	r2, .L2+4
	ldr	r2, [r2]
	orr	r2, r2, #8192
	str     r2, [r3]

	// pinMode(27, ALT4)
	ldr	r3, .L2
	ldr	r2, .L2
	ldr	r2, [r2]
	orr	r2, r2, #6291456
	str     r2, [r3]

	// pinMode(25, ALT4)
	ldr	r3, .L2
	ldr	r2, .L2
	ldr	r2, [r2]
	orr	r2, r2, #98304
	str     r2, [r3]

	// pinMode(24, ALT4)
	ldr	r3, .L2
	ldr	r2, .L2
	ldr	r2, [r2]
	orr	r2, r2, #12288
	str     r2, [r3]

 
	// Call kernel_main
	ldr	r3, =kernel_main
	blx	r3