From c6e0201443080114d18ed10a1a319ce655efd917 Mon Sep 17 00:00:00 2001 From: Pavel Pisa Date: Thu, 19 May 2016 10:24:46 +0200 Subject: arm/raspberrypi: ensure that RTEMS application image can be started by U-boot. The current versions of U-boot start kernel/RTEMS application image with instruction and data caches enabled and it sets exception base register to new address after its self-relocation. ldr r0, [r9, #GD_RELOCADDR] /* r0 = gd->relocaddr */ mcr p15, 0, r0, c12, c0, 0 /* Set VBAR */ Included changes in bsp_start_hook_0 restore default state to allow RTEMS image to run after startup from newer U-boot version on Raspberry Pi. Clear interrupt enable registers in interrupt controller to ensure that RTEMS starts from well defined state. Updates #2783 --- c/src/lib/libbsp/arm/raspberrypi/irq/irq.c | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'c/src/lib/libbsp/arm/raspberrypi/irq/irq.c') diff --git a/c/src/lib/libbsp/arm/raspberrypi/irq/irq.c b/c/src/lib/libbsp/arm/raspberrypi/irq/irq.c index 4132ef9693..07ef9e5b90 100644 --- a/c/src/lib/libbsp/arm/raspberrypi/irq/irq.c +++ b/c/src/lib/libbsp/arm/raspberrypi/irq/irq.c @@ -120,5 +120,9 @@ void bsp_interrupt_handler_default(rtems_vector_number vector) rtems_status_code bsp_interrupt_facility_initialize(void) { raspberrypi_set_exception_handler(ARM_EXCEPTION_IRQ, _ARMV4_Exception_interrupt); + BCM2835_REG(BCM2835_IRQ_DISABLE1) = 0xffffffff; + BCM2835_REG(BCM2835_IRQ_DISABLE2) = 0xffffffff; + BCM2835_REG(BCM2835_IRQ_DISABLE_BASIC) = 0xffffffff; + BCM2835_REG(BCM2835_IRQ_FIQ_CTRL) = 0; return RTEMS_SUCCESSFUL; } -- cgit v1.2.3