board: arm: Add support for Broadcom BCM7445
Add support for loading U-Boot on the Broadcom 7445 SoC. This port
assumes Broadcom's BOLT bootloader is acting as the second stage
bootloader, and U-Boot is acting as the third stage bootloader, loaded
as an ELF program by BOLT.
Signed-off-by: Thomas Fitzsimmons <fitzsim@fitzsim.org>
Cc: Stefan Roese <sr@denx.de>
Cc: Tom Rini <trini@konsulko.com>
Cc: Florian Fainelli <f.fainelli@gmail.com>
diff --git a/include/configs/bcmstb.h b/include/configs/bcmstb.h
new file mode 100644
index 0000000..8c61780
--- /dev/null
+++ b/include/configs/bcmstb.h
@@ -0,0 +1,183 @@
+/* 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 "version.h"
+#include <linux/sizes.h>
+#include <asm/arch/prior_stage.h>
+
+/*
+ * Generic board configuration.
+ */
+#define CONFIG_SYS_GENERIC_BOARD
+
+/*
+ * CPU configuration.
+ */
+#define CONFIG_SKIP_LOWLEVEL_INIT
+
+/*
+ * 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_SYS_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 CONFIG_NR_DRAM_BANKS 3
+
+#define CONFIG_SYS_SDRAM_BASE 0x00000000
+#define CONFIG_SYS_TEXT_BASE 0x80100000
+#define CONFIG_SYS_INIT_RAM_ADDR 0x80200000
+#define CONFIG_SYS_INIT_RAM_SIZE 0x100000
+#define CONFIG_SYS_INIT_SP_ADDR (CONFIG_SYS_INIT_RAM_ADDR + \
+ CONFIG_SYS_INIT_RAM_SIZE - \
+ GENERATED_GBL_DATA_SIZE)
+#define CONFIG_SYS_MALLOC_LEN ((10 * 1024) << 10) /* 10 MiB */
+#define CONFIG_SYS_LOAD_ADDR 0x2000000
+
+/*
+ * CONFIG_SYS_LOAD_ADDR - 1 MiB.
+ */
+#define CONFIG_SYS_FDT_SAVE_ADDRESS 0x1f00000
+#define CONFIG_SYS_CBSIZE 512
+#define CONFIG_SYS_MAXARGS 32
+
+/*
+ * Large kernel image bootm configuration.
+ */
+#define CONFIG_SYS_BOOTM_LEN SZ_64M
+
+/*
+ * NS16550 configuration.
+ */
+#define V_NS16550_CLK 81000000
+
+#define CONFIG_SYS_NS16550
+#define CONFIG_SYS_NS16550_SERIAL
+#define CONFIG_SYS_NS16550_REG_SIZE (-4)
+#define CONFIG_SYS_NS16550_CLK V_NS16550_CLK
+
+/*
+ * Serial console configuration.
+ */
+#define CONFIG_SERIAL3 3
+
+#define CONFIG_BAUDRATE 115200
+#define CONFIG_SYS_BAUDRATE_TABLE {4800, 9600, 19200, 38400, 57600, \
+ 115200}
+
+/*
+ * Informational display configuration.
+ */
+#define CONFIG_REVISION_TAG
+
+/*
+ * Command configuration.
+ */
+#define CONFIG_CMD_ASKENV
+#define CONFIG_CMD_CACHE
+#define CONFIG_CMD_EXT2
+#define CONFIG_CMD_SF
+#define CONFIG_CMD_SPI
+#define CONFIG_CMD_SF_TEST
+#define CONFIG_CMD_MMC
+
+/*
+ * Flash configuration.
+ */
+#define CONFIG_ST_SMI
+#define CONFIG_SPI_FLASH_STMICRO
+#define CONFIG_SPI_FLASH_MACRONIX
+
+/*
+ * Filesystem configuration.
+ */
+#define CONFIG_DOS_PARTITION
+#define CONFIG_CMD_EXT4
+#define CONFIG_FS_EXT4
+#define CONFIG_CMD_FS_GENERIC
+
+/*
+ * Environment configuration.
+ */
+#define CONFIG_SYS_REDUNDAND_ENVIRONMENT
+
+#define CONFIG_ENV_IS_IN_SPI_FLASH 1
+#define CONFIG_ENV_OFFSET 0x1e0000
+#define CONFIG_ENV_SIZE (64 << 10) /* 64 KiB */
+#define CONFIG_ENV_SECT_SIZE CONFIG_ENV_SIZE
+#define CONFIG_ENV_OFFSET_REDUND (CONFIG_ENV_OFFSET + CONFIG_ENV_SIZE)
+#define CONFIG_ENV_OVERWRITE
+
+/*
+ * Save the prior stage provided DTB.
+ */
+#define CONFIG_PREBOOT \
+ "fdt addr ${fdtcontroladdr};" \
+ "fdt move ${fdtcontroladdr} ${fdtsaveaddr};" \
+ "fdt addr ${fdtsaveaddr};"
+/*
+ * Enable in-place RFS with this initrd_high setting.
+ */
+#define CONFIG_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.
+ */
+#define CONFIG_BOARD_LATE_INIT
+
+#define CONFIG_SYS_MAX_FLASH_BANKS 1
+
+#define CONFIG_DM_SPI 1
+
+#endif /* __BCMSTB_H */