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/* 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 */
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