163 lines
4.0 KiB
C
163 lines
4.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* (C) Copyright 2018 Cisco Systems, Inc.
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*
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* Author: Thomas Fitzsimmons <fitzsim@fitzsim.org>
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*
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* Configuration settings for the Broadcom BCMSTB SoC family.
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*/
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#ifndef __BCMSTB_H
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#define __BCMSTB_H
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#include "version.h"
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#include <linux/sizes.h>
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#ifndef __ASSEMBLY__
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#include <linux/stringify.h>
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#include <linux/types.h>
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struct bcmstb_boot_parameters {
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u32 r0;
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u32 r1;
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u32 r2;
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u32 r3;
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u32 sp;
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u32 lr;
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};
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extern struct bcmstb_boot_parameters bcmstb_boot_parameters;
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extern phys_addr_t prior_stage_fdt_address;
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#endif /* __ASSEMBLY__ */
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/*
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* CPU configuration.
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*/
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#define CONFIG_SKIP_LOWLEVEL_INIT
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/*
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* Memory configuration.
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*
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* The prior stage BOLT bootloader sets up memory for us.
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*
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* An example boot memory layout after loading everything is:
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*
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* 0x0000 8000 vmlinux.bin.gz
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* : [~31 MiB uncompressed max]
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* 0x01ef f000 FIT containing signed public key
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* : [~2 KiB in size]
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* 0x01f0 0000 DTB copied from prior-stage-provided region
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* : [~1 MiB max]
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* 0x0200 0000 FIT containing ramdisk and device tree
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* : initramfs.cpio.gz
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* : [~208 MiB uncompressed max, to CMA/bmem low address]
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* : [~80 MiB compressed max, to PSB low address]
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* : device tree binary
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* : [~60 KiB]
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* 0x0700 0000 Prior stage bootloader (PSB)
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* :
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* 0x0761 7000 Prior-stage-provided device tree binary (DTB)
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* : [~40 KiB in size]
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* 0x0f00 0000 Contiguous memory allocator (CMA/bmem) low address
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* :
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* 0x8010 0000 U-Boot code at ELF load address
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* : [~500 KiB in size, stripped]
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* 0xc000 0000 Top of RAM
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*
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* Setting gd->relocaddr to CONFIG_SYS_TEXT_BASE in dram_init_banksize
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* prevents U-Boot from relocating itself when it is run as an ELF
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* program by the prior stage bootloader.
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*
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* We want to keep the ramdisk and FDT in the FIT image in-place, to
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* accommodate stblinux's bmem and CMA regions. To accomplish this,
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* we set initrd_high and fdt_high to 0xffffffff, and the load and
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* entry addresses of the FIT ramdisk entry to 0x0.
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*
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* Overwriting the prior stage bootloader causes memory instability,
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* so the compressed initramfs needs to fit between the load address
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* and the PSB low address. In BOLT's default configuration this
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* limits the compressed size of the initramfs to approximately 80
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* MiB. However, BOLT can be configured to allow loading larger
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* initramfs images, in which case this limitation is eliminated.
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*/
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#define CONFIG_SYS_SDRAM_BASE 0x00000000
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#define CONFIG_SYS_INIT_RAM_SIZE 0x100000
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#define CONFIG_SYS_INIT_SP_ADDR (CONFIG_SYS_INIT_RAM_ADDR + \
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CONFIG_SYS_INIT_RAM_SIZE - \
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GENERATED_GBL_DATA_SIZE)
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#define CONFIG_SYS_LOAD_ADDR 0x2000000
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/*
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* CONFIG_SYS_LOAD_ADDR - 1 MiB.
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*/
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#define CONFIG_SYS_FDT_SAVE_ADDRESS 0x1f00000
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#define CONFIG_SYS_CBSIZE 512
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#define CONFIG_SYS_MAXARGS 32
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/*
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* Large kernel image bootm configuration.
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*/
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#define CONFIG_SYS_BOOTM_LEN SZ_64M
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/*
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* NS16550 configuration.
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*/
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#define V_NS16550_CLK 81000000
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#define CONFIG_SYS_NS16550
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#define CONFIG_SYS_NS16550_SERIAL
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#define CONFIG_SYS_NS16550_REG_SIZE (-4)
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#define CONFIG_SYS_NS16550_CLK V_NS16550_CLK
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/*
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* Serial console configuration.
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*/
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#define CONFIG_SYS_BAUDRATE_TABLE {4800, 9600, 19200, 38400, 57600, \
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115200}
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/*
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* Informational display configuration.
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*/
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#define CONFIG_REVISION_TAG
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/*
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* Command configuration.
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*/
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/*
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* Flash configuration.
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*/
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#define CONFIG_ST_SMI
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#define CONFIG_SPI_FLASH_STMICRO
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#define CONFIG_SPI_FLASH_MACRONIX
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/*
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* Filesystem configuration.
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*/
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#define CONFIG_DOS_PARTITION
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/*
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* Environment configuration.
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*/
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/*
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* Save the prior stage provided DTB.
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*/
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/*
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* Enable in-place RFS with this initrd_high setting.
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*/
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#define CONFIG_EXTRA_ENV_SETTINGS \
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"fdtsaveaddr=" __stringify(CONFIG_SYS_FDT_SAVE_ADDRESS) "\0" \
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"initrd_high=0xffffffff\0" \
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"fdt_high=0xffffffff\0"
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/*
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* Set fdtaddr to prior stage-provided DTB in board_late_init, when
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* writeable environment is available.
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*/
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#endif /* __BCMSTB_H */
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