i.MX Processorsのトピックkernel enable mmu

kernel enable mmu

lifusong — Fri, 24 Apr 2015 13:33:40 GMT

Dear sir.

our board use imx6qsabresd and bsp is 4.4.3_r1

when boot into kernel and enable mmu ,will case our board lose power

ENTRY(__turn_mmu_on)

b __error_Debug //board will lose power after show this debug info.can't see the next debug info.

mov r0, r0

instr_sync

mcr p15, 0, r0, c1, c0, 0 @ write control reg

mrc p15, 0, r3, c0, c0, 0 @ read id reg

instr_sync

mov r3, r3

mov r3, r13

mov pc, r3

b __error_Debug

__turn_mmu_on_end:

ENDPROC(__turn_mmu_on)

.popsection

who can help me ? thanks.

lifusong — Fri, 24 Apr 2015 15:08:55 GMT

sorry, the board lose power not case by enable mmu

if i add below to start_kernel end

while(1){};

the board not shutdown .but can't see any printk output info.

can see putstr output info.

why?

igorpadykov — Sat, 25 Apr 2015 05:10:46 GMT

Hi li

to better understand problem you can try to run minimal image or just SDK

also it may be recommended to check

Chapter 8 Avoiding Board Bring-up Problems IMX6DQ6SDLHDG

Best regards

igor

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lifusong — Sat, 25 Apr 2015 08:30:34 GMT

hi igo.

thanks for your reply, I had found this issue.

there is the pmic ,our board use da9063,different with demobaord so run to start_kernel ->timer_init ,will case lose power.