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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