Open Menu / include / configs / bcmstb.h
Loading...
  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
/* SPDX-License-Identifier: GPL-2.0+ */
/*
 * (C) Copyright 2018  Cisco Systems, Inc.
 *
 * Author: Thomas Fitzsimmons <fitzsim@fitzsim.org>
 *
 * Configuration settings for the Broadcom BCMSTB SoC family.
 */

#ifndef __BCMSTB_H
#define __BCMSTB_H

#include <linux/sizes.h>

#ifndef __ASSEMBLY__

#include <linux/stringify.h>
#include <linux/types.h>

struct bcmstb_boot_parameters {
	u32 r0;
	u32 r1;
	u32 r2;
	u32 r3;
	u32 sp;
	u32 lr;
};

extern struct bcmstb_boot_parameters bcmstb_boot_parameters;

extern phys_addr_t prior_stage_fdt_address;

#endif /* __ASSEMBLY__ */

/*
 * CPU configuration.
 */

/*
 * Memory configuration.
 *
 * The prior stage BOLT bootloader sets up memory for us.
 *
 * An example boot memory layout after loading everything is:
 *
 *	 0x0000 8000	vmlinux.bin.gz
 *	       :	[~31 MiB uncompressed max]
 *	 0x01ef f000	FIT containing signed public key
 *	       :	[~2 KiB in size]
 *	 0x01f0 0000	DTB copied from prior-stage-provided region
 *	       :	[~1 MiB max]
 *	 0x0200 0000	FIT containing ramdisk and device tree
 *             :	  initramfs.cpio.gz
 *	       :	  [~208 MiB uncompressed max, to CMA/bmem low address]
 *	       :	  [~80 MiB compressed max, to PSB low address]
 *             :	  device tree binary
 *             :	  [~60 KiB]
 *	 0x0700 0000	Prior stage bootloader (PSB)
 *	       :
 *	 0x0761 7000	Prior-stage-provided device tree binary (DTB)
 *	       :	[~40 KiB in size]
 *	 0x0f00 0000	Contiguous memory allocator (CMA/bmem) low address
 *	       :
 *	 0x8010 0000	U-Boot code at ELF load address
 *	       :	[~500 KiB in size, stripped]
 *	 0xc000 0000	Top of RAM
 *
 * Setting gd->relocaddr to CONFIG_TEXT_BASE in dram_init_banksize
 * prevents U-Boot from relocating itself when it is run as an ELF
 * program by the prior stage bootloader.
 *
 * We want to keep the ramdisk and FDT in the FIT image in-place, to
 * accommodate stblinux's bmem and CMA regions.  To accomplish this,
 * we set initrd_high and fdt_high to 0xffffffff, and the load and
 * entry addresses of the FIT ramdisk entry to 0x0.
 *
 * Overwriting the prior stage bootloader causes memory instability,
 * so the compressed initramfs needs to fit between the load address
 * and the PSB low address.  In BOLT's default configuration this
 * limits the compressed size of the initramfs to approximately 80
 * MiB.  However, BOLT can be configured to allow loading larger
 * initramfs images, in which case this limitation is eliminated.
 */
#define CFG_SYS_SDRAM_BASE		0x00000000
#define CFG_SYS_INIT_RAM_SIZE	0x100000

/*
 * CONFIG_SYS_LOAD_ADDR - 1 MiB.
 */

/*
 * Large kernel image bootm configuration.
 */

/*
 * Informational display configuration.
 */

/*
 * Command configuration.
 */

/*
 * Flash configuration.
 */

/*
 * Filesystem configuration.
 */

/*
 * Environment configuration.
 */

/*
 * Save the prior stage provided DTB.
 */
/*
 * Enable in-place RFS with this initrd_high setting.
 */
#define CFG_EXTRA_ENV_SETTINGS					\
	"fdtsaveaddr=" __stringify(CONFIG_SYS_FDT_SAVE_ADDRESS) "\0"	\
	"initrd_high=0xffffffff\0"					\
	"fdt_high=0xffffffff\0"

/*
 * Set fdtaddr to prior stage-provided DTB in board_late_init, when
 * writeable environment is available.
 */

#endif /* __BCMSTB_H */