On 6 September 2012 18:12, Dave Martin <dave.martin@xxxxxxxxxx> wrote:
> Signed-off-by: Dave Martin <dave.martin@xxxxxxxxxx>
This patch causes the kernel to get stuck at "Calibrating delay loop...".
I'm not sure why this happens (investigating) but if I move the
enter_hyp macro call back to where it used to be (leaving the rest of
the patch intact) it boots OK...
> ---
> boot.S | 15 +++++++++++++--
> semi_loader.h | 6 ++++--
> 2 files changed, 17 insertions(+), 4 deletions(-)
>
> diff --git a/boot.S b/boot.S
> index 128f74e..fe7acdf 100644
> --- a/boot.S
> +++ b/boot.S
> @@ -96,8 +96,6 @@ start:
> mov r7, #0xfffffff0
> smc #0 @ Set HVBAR
>
> - enter_hyp
> -
> @ Check CPU nr again
> mrc p15, 0, r0, c0, c0, 5 @ MPIDR (ARMv7 only)
> and r0, r0, #15 @ CPU number
> @@ -125,6 +123,8 @@ start:
> ldr r1, [r0]
> cmp r1, #0
> beq 1b
> +
> + enter_hyp
> mov pc, r1 @ branch to the given address
> #endif
>
> @@ -170,6 +170,17 @@ __semi_call:
> #endif
> mov pc, lr
>
> +.globl __boot_kernel
> +__boot_kernel:
> + mov r4, r0
> + stmfd sp!, {r1-r3}
> + ldmia sp, {r0-r3}
Since the kernel only really needs 3 arguments, it would be
less hassle to drop the 4th param to boot_kernel() and then
have __boot_kernel() be passed r0,r1,r2,entrypoint.
> +
> + enter_hyp
> +
> + bx r4
> +.type __boot_kernel, %function
> +
> @
> @ Data
> @
> diff --git a/semi_loader.h b/semi_loader.h
> index 6afba40..29f3d63 100644
> --- a/semi_loader.h
> +++ b/semi_loader.h
> @@ -90,10 +90,12 @@ struct loader_info {
>
> void load_kernel(struct loader_info *info);
>
> +void __boot_kernel(unsigned entry_point,
> + unsigned r0, unsigned r1, unsigned r2, unsigned r3);
> +
> static void boot_kernel(struct loader_info *info,
> unsigned r0, unsigned r1, unsigned r2, unsigned r3) {
> - ((void (*)(unsigned, unsigned, unsigned, unsigned))info->kernel_entry)(
> - r0, r1, r2, r3);
> + __boot_kernel(info->kernel_entry, r0, r1, r2, r3);
> }
>
> #endif /* ! SEMI_LOADER_H */
> --
> 1.7.4.1
>
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