u-boot/arch/arm/mach-zynq/lowlevel_init.S

/*
 * Copyright (C) 2013 - 2015 Xilinx, Inc. All rights reserved.
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#include <asm-offsets.h>
#include <config.h>
#include <linux/linkage.h>

ENTRY(lowlevel_init)

	/* Enable the the VFP */
	mrc	p15, 0, r1, c1, c0, 2
	orr	r1, r1, #(0x3 << 20)
	orr	r1, r1, #(0x3 << 20)
	mcr	p15, 0, r1, c1, c0, 2
	isb
	fmrx	r1, FPEXC
	orr	r1,r1, #(1<<30)
	fmxr	FPEXC, r1

	/* Move back to caller */
	mov	pc, lr

ENDPROC(lowlevel_init)
ARM: zynq: Enable the Neon instructions Added the lowlevel_init to enable the Neon instructions. Initially the u-boot was causing undefined instruction exception if loaded through tcl, and working fine if loaded through FSBL. The exception was causing in convertion formula of given time to ticks. It was because, the Neon instructions were disabled and hence causing the undefined exception. In FSBL case, the FSBL was enabling the Neon instructions. Hence, added the lowlevel_init to enable the Neon instructions. Also enable neon instructions for non-xilinx toolchain. Signed-off-by: Siva Durga Prasad Paladugu <sivadur@xilinx.com> Acked-by: Radhey Shyam Pandey <radheys@xilinx.com> Signed-off-by: Michal Simek <michal.simek@xilinx.com> 2015-01-23 08:45:12 +00:00			`/*`
arm: zynq: Update years in copyright to reflect latest changes Updating year in zynq files. Also add missing Copyright to board.c. Signed-off-by: Michal Simek <michal.simek@xilinx.com> 2018-01-17 06:37:47 +00:00			`* Copyright (C) 2013 - 2015 Xilinx, Inc. All rights reserved.`
ARM: zynq: Enable the Neon instructions Added the lowlevel_init to enable the Neon instructions. Initially the u-boot was causing undefined instruction exception if loaded through tcl, and working fine if loaded through FSBL. The exception was causing in convertion formula of given time to ticks. It was because, the Neon instructions were disabled and hence causing the undefined exception. In FSBL case, the FSBL was enabling the Neon instructions. Hence, added the lowlevel_init to enable the Neon instructions. Also enable neon instructions for non-xilinx toolchain. Signed-off-by: Siva Durga Prasad Paladugu <sivadur@xilinx.com> Acked-by: Radhey Shyam Pandey <radheys@xilinx.com> Signed-off-by: Michal Simek <michal.simek@xilinx.com> 2015-01-23 08:45:12 +00:00			`*`
			`* SPDX-License-Identifier: GPL-2.0+`
			`*/`

			`#include <asm-offsets.h>`
			`#include <config.h>`
			`#include <linux/linkage.h>`

			`ENTRY(lowlevel_init)`

			`/* Enable the the VFP */`
			`mrc p15, 0, r1, c1, c0, 2`
			`orr r1, r1, #(0x3 << 20)`
			`orr r1, r1, #(0x3 << 20)`
			`mcr p15, 0, r1, c1, c0, 2`
			`isb`
			`fmrx r1, FPEXC`
			`orr r1,r1, #(1<<30)`
			`fmxr FPEXC, r1`

			`/* Move back to caller */`
			`mov pc, lr`

			`ENDPROC(lowlevel_init)`