board: Add new Broadcom Northstar board

This adds a simple Northstar "BRCMNS" board to be used with
the BCM4708x and BCM5301x chips.

The main intention is to use this with the D-Link DIR-890L
and DIR-885L routers for loading the kernel into RAM from
NAND memory using the BCH-1 ECC and using the separately
submitted SEAMA load command, so we are currently not adding
support for things such as networking.

The DTS file is a multiplatform NorthStar board, designed to
be usable with several NorthStar designs by avoiding any
particulars not related to the operation of U-Boot.

If other board need other ECC for example, they need to
create a separate DTS file and augment the code, but I don't
know if any other users will turn up.

Cc: Rafał Miłecki <rafal@milecki.pl>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

4 files changed, 80 insertions, 0 deletions

diff --git a/board/broadcom/bcmns/Kconfig b/board/broadcom/bcmns/Kconfig
new file mode 100644
index 0000000..82f4709
--- /dev/null
+++ b/board/broadcom/bcmns/Kconfig
@@ -0,0 +1,12 @@
+if TARGET_BCMNS
+
+config SYS_BOARD
+	default "bcmns"
+
+config SYS_VENDOR
+	default "broadcom"
+
+config SYS_CONFIG_NAME
+	default "bcmns"
+
+endif
diff --git a/board/broadcom/bcmns/MAINTAINERS b/board/broadcom/bcmns/MAINTAINERS
new file mode 100644
index 0000000..fd37c33
--- /dev/null
+++ b/board/broadcom/bcmns/MAINTAINERS
@@ -0,0 +1,6 @@
+BCMNS BOARD
+M:	Linus Walleij <linus.walleij@linaro.org>
+S:	Maintained
+F:	board/broadcom/bcmnsp/
+F:	configs/bcmnsp_defconfig
+F:	include/configs/bcmnsp.h
diff --git a/board/broadcom/bcmns/Makefile b/board/broadcom/bcmns/Makefile
new file mode 100644
index 0000000..8a6a854
--- /dev/null
+++ b/board/broadcom/bcmns/Makefile
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
+obj-y	:= ns.o
diff --git a/board/broadcom/bcmns/ns.c b/board/broadcom/bcmns/ns.c
new file mode 100644
index 0000000..1249e45
--- /dev/null
+++ b/board/broadcom/bcmns/ns.c
@@ -0,0 +1,60 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Broadcom Northstar generic board set-up code
+ * Copyright (C) 2023 Linus Walleij <linus.walleij@linaro.org>
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <init.h>
+#include <log.h>
+#include <ram.h>
+#include <serial.h>
+#include <asm/global_data.h>
+#include <asm/io.h>
+#include <asm/armv7m.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+int dram_init(void)
+{
+	return fdtdec_setup_mem_size_base();
+}
+
+int dram_init_banksize(void)
+{
+	return fdtdec_setup_memory_banksize();
+}
+
+int board_late_init(void)
+{
+	/* LEDs etc can be initialized here */
+	return 0;
+}
+
+int board_init(void)
+{
+	return 0;
+}
+
+void reset_cpu(void)
+{
+}
+
+int print_cpuinfo(void)
+{
+	printf("BCMNS Northstar SoC\n");
+	return 0;
+}
+
+int misc_init_r(void)
+{
+	return 0;
+}
+
+int ft_board_setup(void *fdt, struct bd_info *bd)
+{
+	printf("Northstar board setup: DTB at 0x%08lx\n", (ulong)fdt);
+	return 0;
+}
+