[U-Boot] Address Space in Uboot MPC85xx

[Vignesh Kumar B]

Hi,

I am going through the u-boot code for MPC85xx while I see some code as
follows.
So what is this AS (Address Space) required and what does it do? What is
happening when we switch from AS=1 to AS=0.

Can someone explain me what is going on?

/* create a temp mapping in AS=1 to the boot window */
	lis     r6,FSL_BOOKE_MAS0(1, 15, 0)@h
	ori     r6,r6,FSL_BOOKE_MAS0(1, 15, 0)@l
	.
	.
	.
	.

/* create a temp mapping in AS=1 to the stack */
	lis     r6,FSL_BOOKE_MAS0(1, 14, 0)@h
	ori     r6,r6,FSL_BOOKE_MAS0(1, 14, 0)@l
	.
	.
	.
	.
/* switch back to AS = 0 */
	lis	r3,(MSR_CE|MSR_ME|MSR_DE)@h
	ori	r3,r3,(MSR_CE|MSR_ME|MSR_DE)@l

Regards,
Vignesh Kumar B
Member Technical Staff
HCL TECHNOLOGIES LTD.,
Mob: +91-9600015988
www.hcl.in


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