On 08/08/2013 08:20 AM, zhaobin xv wrote: > In linux/arch/arm/boot/ > compressed/head.S: > > > #ifndef __ARM_ARCH_2__ > /* > * Booting from Angel - need to enter SVC mode and disable > * FIQs/IRQs (numeric definitions from angel arm.h source). > * We only do this if we were in user mode on entry. > */ > mrs r2, cpsr @ get current mode > tst r2, #3 @ not user? > bne not_angel > mov r0, #0x17 @ angel_SWIreason_EnterSVC > swi 0x123456 @ angel_SWI_ARM > > > I don't know what the"__ARM_ARCH_2__" mean? http://en.wikipedia.org/wiki/List_of_ARM_microprocessor_cores Andrew.
