1/*
2 * A lowlevel_init function that sets up the stack to call a C function to
3 * perform further init.
4 *
5 * (C) Copyright 2010
6 * Texas Instruments, <www.ti.com>
7 *
8 * Author :
9 *	Aneesh V	<aneesh@ti.com>
10 *
11 * SPDX-License-Identifier:	GPL-2.0+
12 */
13
14#include <asm-offsets.h>
15#include <config.h>
16#include <linux/linkage.h>
17
18ENTRY(lowlevel_init)
19	/*
20	 * Setup a temporary stack. Global data is not available yet.
21	 */
22	ldr	sp, =CONFIG_SYS_INIT_SP_ADDR
23	bic	sp, sp, #7 /* 8-byte alignment for ABI compliance */
24#ifdef CONFIG_DM
25	mov	r9, #0
26#else
27	/*
28	 * Set up global data for boards that still need it. This will be
29	 * removed soon.
30	 */
31#ifdef CONFIG_SPL_BUILD
32	ldr	r9, =gdata
33#else
34	sub	sp, sp, #GD_SIZE
35	bic	sp, sp, #7
36	mov	r9, sp
37#endif
38#endif
39	/*
40	 * Save the old lr(passed in ip) and the current lr to stack
41	 */
42	push	{ip, lr}
43
44	/*
45	 * Call the very early init function. This should do only the
46	 * absolute bare minimum to get started. It should not:
47	 *
48	 * - set up DRAM
49	 * - use global_data
50	 * - clear BSS
51	 * - try to start a console
52	 *
53	 * For boards with SPL this should be empty since SPL can do all of
54	 * this init in the SPL board_init_f() function which is called
55	 * immediately after this.
56	 */
57	bl	s_init
58	pop	{ip, pc}
59ENDPROC(lowlevel_init)
60