On Fri, 24 Mar 2000, James Kim(Jin-Soo) wrote:
> Hello!
>
> Is there anybody to let me execute kernel using angelboot utility? My
> target b/d is ebsa285.
> Please check my procedure for downloading.
>
> 1) Build kernel image using "make zImage" : kernel version is 2.2.12rmk1
> 2) Download kernel using "angelboot -v -d /dev/cua0 -S 115200 -e 8000 -b
> 8000 -0 0 -1 4 zImage"
> 3) I've checked whether it works or not with LED. It worked well until
> flush I,D cache instruction starts in .Larmv4_flush_early.
> So I've removed 3 lines "mcr p15, 0 , r0, c7, c7" , "mcr p15, 0, r0, c7,
> c10, 4", "mcr p15, 0, r0, c8, c7".
> After removing 3 lines, I could know it's working until MMU on.
> After MMU enabled, I can't trace anymore...
>
> Is there any missing part for downloading or building image?
In the entry code somewhere (in linux/arch/arm/boot/compressed/head.S),
you must get control from angel. Add the following code:
---
@ need to enter SVC mode
#define angel_SWIreason_EnterSVC 0x17 /* from arm.h, in angel source */
#define angel_SWI_ARM 0x123456
mov r0, #angel_SWIreason_EnterSVC
swi #angel_SWI_ARM
@ turn off interrupts to prevent the angel from running
mrs r0, cpsr
orr r0, r0, #0xc0
msr cpsr, r0
---
Nicolas
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