1 /* SPDX-License-Identifier: GPL-2.0+ */
3 * (C) Copyright 2018 Cisco Systems, Inc.
5 * Author: Thomas Fitzsimmons <fitzsim@fitzsim.org>
7 * Configuration settings for the Broadcom BCMSTB SoC family.
14 #include <linux/sizes.h>
18 #include <linux/stringify.h>
19 #include <linux/types.h>
21 struct bcmstb_boot_parameters {
30 extern struct bcmstb_boot_parameters bcmstb_boot_parameters;
32 extern phys_addr_t prior_stage_fdt_address;
34 #endif /* __ASSEMBLY__ */
39 #define CONFIG_SKIP_LOWLEVEL_INIT
42 * Memory configuration.
44 * The prior stage BOLT bootloader sets up memory for us.
46 * An example boot memory layout after loading everything is:
48 * 0x0000 8000 vmlinux.bin.gz
49 * : [~31 MiB uncompressed max]
50 * 0x01ef f000 FIT containing signed public key
52 * 0x01f0 0000 DTB copied from prior-stage-provided region
54 * 0x0200 0000 FIT containing ramdisk and device tree
56 * : [~208 MiB uncompressed max, to CMA/bmem low address]
57 * : [~80 MiB compressed max, to PSB low address]
58 * : device tree binary
60 * 0x0700 0000 Prior stage bootloader (PSB)
62 * 0x0761 7000 Prior-stage-provided device tree binary (DTB)
64 * 0x0f00 0000 Contiguous memory allocator (CMA/bmem) low address
66 * 0x8010 0000 U-Boot code at ELF load address
67 * : [~500 KiB in size, stripped]
68 * 0xc000 0000 Top of RAM
70 * Setting gd->relocaddr to CONFIG_SYS_TEXT_BASE in dram_init_banksize
71 * prevents U-Boot from relocating itself when it is run as an ELF
72 * program by the prior stage bootloader.
74 * We want to keep the ramdisk and FDT in the FIT image in-place, to
75 * accommodate stblinux's bmem and CMA regions. To accomplish this,
76 * we set initrd_high and fdt_high to 0xffffffff, and the load and
77 * entry addresses of the FIT ramdisk entry to 0x0.
79 * Overwriting the prior stage bootloader causes memory instability,
80 * so the compressed initramfs needs to fit between the load address
81 * and the PSB low address. In BOLT's default configuration this
82 * limits the compressed size of the initramfs to approximately 80
83 * MiB. However, BOLT can be configured to allow loading larger
84 * initramfs images, in which case this limitation is eliminated.
86 #define CONFIG_SYS_SDRAM_BASE 0x00000000
87 #define CONFIG_SYS_INIT_RAM_SIZE 0x100000
88 #define CONFIG_SYS_INIT_SP_ADDR (CONFIG_SYS_INIT_RAM_ADDR + \
89 CONFIG_SYS_INIT_RAM_SIZE - \
90 GENERATED_GBL_DATA_SIZE)
91 #define CONFIG_SYS_LOAD_ADDR 0x2000000
94 * CONFIG_SYS_LOAD_ADDR - 1 MiB.
96 #define CONFIG_SYS_FDT_SAVE_ADDRESS 0x1f00000
97 #define CONFIG_SYS_CBSIZE 512
98 #define CONFIG_SYS_MAXARGS 32
101 * Large kernel image bootm configuration.
103 #define CONFIG_SYS_BOOTM_LEN SZ_64M
106 * NS16550 configuration.
108 #define V_NS16550_CLK 81000000
110 #define CONFIG_SYS_NS16550
111 #define CONFIG_SYS_NS16550_SERIAL
112 #define CONFIG_SYS_NS16550_REG_SIZE (-4)
113 #define CONFIG_SYS_NS16550_CLK V_NS16550_CLK
116 * Serial console configuration.
118 #define CONFIG_SYS_BAUDRATE_TABLE {4800, 9600, 19200, 38400, 57600, \
122 * Informational display configuration.
124 #define CONFIG_REVISION_TAG
127 * Command configuration.
131 * Flash configuration.
133 #define CONFIG_ST_SMI
134 #define CONFIG_SPI_FLASH_STMICRO
135 #define CONFIG_SPI_FLASH_MACRONIX
138 * Filesystem configuration.
140 #define CONFIG_DOS_PARTITION
143 * Environment configuration.
147 * Save the prior stage provided DTB.
150 * Enable in-place RFS with this initrd_high setting.
152 #define CONFIG_EXTRA_ENV_SETTINGS \
153 "fdtsaveaddr=" __stringify(CONFIG_SYS_FDT_SAVE_ADDRESS) "\0" \
154 "initrd_high=0xffffffff\0" \
155 "fdt_high=0xffffffff\0"
158 * Set fdtaddr to prior stage-provided DTB in board_late_init, when
159 * writeable environment is available.
162 #endif /* __BCMSTB_H */