Get DTB pointer (located in r2) from SRC_GPR3 (argument register for secondary core) Signed-off-by: Stefan Agner <stefan@xxxxxxxx> --- This is clearly a hack but it works around the need of a boot loader on the Cortex-M4. I guess there is no way neither its acceptable to do this on machine level..? But then, this can also be done with a minimal boot loader loaded just in front of the kernel by the m4boot utility. arch/arm/kernel/head-nommu.S | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/arch/arm/kernel/head-nommu.S b/arch/arm/kernel/head-nommu.S index cc176b6..0468683 100644 --- a/arch/arm/kernel/head-nommu.S +++ b/arch/arm/kernel/head-nommu.S @@ -37,6 +37,10 @@ * */ +#define SRC_BASE 0x4006e000 +#define SRC_GPR2 0x28 +#define SRC_GPR3 0x2c + __HEAD #ifdef CONFIG_CPU_THUMBONLY @@ -57,6 +61,10 @@ ENTRY(stext) #if defined(CONFIG_CPU_CP15) mrc p15, 0, r9, c0, c0 @ get processor id #elif defined(CONFIG_CPU_V7M) + + ldr r0, =SRC_BASE + ldr r1, =0xffffffff @ Machine ID + ldr r2, [r0, #SRC_GPR3 ] @ DT pointer from argument register ldr r9, =BASEADDR_V7M_SCB ldr r9, [r9, V7M_SCB_CPUID] #else -- 2.1.2 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
