include/configs/rpi.h

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * (C) Copyright 2012-2016 Stephen Warren
 */

#ifndef __CONFIG_H
#define __CONFIG_H

#include <linux/sizes.h>
#include <asm/arch/timer.h>

#if defined(CONFIG_TARGET_RPI_2) || defined(CONFIG_TARGET_RPI_3_32B)
#define CONFIG_SKIP_LOWLEVEL_INIT
#endif

/* Architecture, CPU, etc.*/
#define CONFIG_ARCH_CPU_INIT

/* Use SoC timer for AArch32, but architected timer for AArch64 */
#ifndef CONFIG_ARM64
#define CONFIG_SYS_TIMER_RATE		1000000
#define CONFIG_SYS_TIMER_COUNTER	\
	(&((struct bcm2835_timer_regs *)BCM2835_TIMER_PHYSADDR)->clo)
#endif

/*
 * 2835 is a SKU in a series for which the 2708 is the first or primary SoC,
 * so 2708 has historically been used rather than a dedicated 2835 ID.
 *
 * We don't define a machine type for bcm2709/bcm2836 since the RPi Foundation
 * chose to use someone else's previously registered machine ID (3139, MX51_GGC)
 * rather than obtaining a valid ID:-/
 *
 * For the bcm2837, hopefully a machine type is not needed, since everything
 * is DT.
 */
#ifdef CONFIG_BCM2835
#define CONFIG_MACH_TYPE		MACH_TYPE_BCM2708
#endif

/* Memory layout */
#define CONFIG_SYS_SDRAM_BASE		0x00000000
#define CONFIG_SYS_UBOOT_BASE		CONFIG_SYS_TEXT_BASE
/*
 * The board really has 256M. However, the VC (VideoCore co-processor) shares
 * the RAM, and uses a configurable portion at the top. We tell U-Boot that a
 * smaller amount of RAM is present in order to avoid stomping on the area
 * the VC uses.
 */
#define CONFIG_SYS_SDRAM_SIZE		SZ_128M
#define CONFIG_SYS_INIT_SP_ADDR		(CONFIG_SYS_SDRAM_BASE + \
					 CONFIG_SYS_SDRAM_SIZE - \
					 GENERATED_GBL_DATA_SIZE)
#define CONFIG_SYS_MALLOC_LEN		SZ_4M
#define CONFIG_SYS_MEMTEST_START	0x00100000
#define CONFIG_SYS_MEMTEST_END		0x00200000
#define CONFIG_LOADADDR			0x00200000

/* Devices */
/* GPIO */
#define CONFIG_BCM2835_GPIO
/* LCD */
#define CONFIG_LCD_DT_SIMPLEFB
#define CONFIG_VIDEO_BCM2835

#ifdef CONFIG_CMD_USB
#define CONFIG_TFTP_TSIZE
#endif

/* Console configuration */
#define CONFIG_SYS_CBSIZE		1024

/* Environment */
#define CONFIG_ENV_SIZE			SZ_16K
#define CONFIG_SYS_LOAD_ADDR		0x1000000
#define CONFIG_PREBOOT			"usb start"

/* Shell */

/* ATAGs support for bootm/bootz */
#define CONFIG_SETUP_MEMORY_TAGS
#define CONFIG_CMDLINE_TAG
#define CONFIG_INITRD_TAG

/* Environment */
#define ENV_DEVICE_SETTINGS \
	"stdin=serial,usbkbd\0" \
	"stdout=serial,vidconsole\0" \
	"stderr=serial,vidconsole\0"

#ifdef CONFIG_ARM64
#define FDT_HIGH "ffffffffffffffff"
#define INITRD_HIGH "ffffffffffffffff"
#else
#define FDT_HIGH "ffffffff"
#define INITRD_HIGH "ffffffff"
#endif

/*
 * Memory layout for where various images get loaded by boot scripts:
 *
 * I suspect address 0 is used as the SMP pen on the RPi2, so avoid this.
 *
 * Older versions of the boot firmware place the firmware-loaded DTB at 0x100,
 * newer versions place it in high memory. So prevent U-Boot from doing its own
 * DTB + initrd relocation so that we won't accidentally relocate the initrd
 * over the firmware-loaded DTB and generally try to lay out things starting
 * from the bottom of RAM.
 *
 * kernel_addr_r has different constraints on ARM and Aarch64.  For 32-bit ARM,
 * it must be within the first 128M of RAM in order for the kernel's
 * CONFIG_AUTO_ZRELADDR option to work. The kernel itself will be decompressed
 * to 0x8000 but the decompressor clobbers 0x4000-0x8000 as well. The
 * decompressor also likes to relocate itself to right past the end of the
 * decompressed kernel, so in total the sum of the compressed and and
 * decompressed kernel needs to be reserved.
 *
 *   For Aarch64, the kernel image is uncompressed and must be loaded at
 *   text_offset bytes (specified in the header of the Image) into a 2MB
 *   boundary. The 'booti' command relocates the image if necessary. Linux uses
 *   a default text_offset of 0x80000.  In summary, loading at 0x80000
 *   satisfies all these constraints and reserving memory up to 0x02400000
 *   permits fairly large (roughly 36M) kernels.
 *
 * scriptaddr and pxefile_addr_r can be pretty much anywhere that doesn't
 * conflict with something else. Reserving 1M for each of them at
 * 0x02400000-0x02500000 and 0x02500000-0x02600000 should be plenty.
 *
 * On ARM, both the DTB and any possible initrd must be loaded such that they
 * fit inside the lowmem mapping in Linux. In practice, this usually means not
 * more than ~700M away from the start of the kernel image but this number can
 * be larger OR smaller depending on e.g. the 'vmalloc=xxxM' command line
 * parameter given to the kernel. So reserving memory from low to high
 * satisfies this constraint again. Reserving 1M at 0x02600000-0x02700000 for
 * the DTB leaves rest of the free RAM to the initrd starting at 0x02700000.
 * Even with the smallest possible CPU-GPU memory split of the CPU getting
 * only 64M, the remaining 25M starting at 0x02700000 should allow quite
 * large initrds before they start colliding with U-Boot.
 */
#define ENV_MEM_LAYOUT_SETTINGS \
	"fdt_high=" FDT_HIGH "\0" \
	"initrd_high=" INITRD_HIGH "\0" \
	"kernel_addr_r=0x00080000\0" \
	"scriptaddr=0x02400000\0" \
	"pxefile_addr_r=0x02500000\0" \
	"fdt_addr_r=0x02600000\0" \
	"ramdisk_addr_r=0x02700000\0"

#define BOOT_TARGET_DEVICES(func) \
	func(MMC, mmc, 0) \
	func(USB, usb, 0) \
	func(PXE, pxe, na) \
	func(DHCP, dhcp, na)
#include <config_distro_bootcmd.h>

#define CONFIG_EXTRA_ENV_SETTINGS \
	"dhcpuboot=usb start; dhcp u-boot.uimg; bootm\0" \
	ENV_DEVICE_SETTINGS \
	ENV_MEM_LAYOUT_SETTINGS \
	BOOTENV


#endif