avionic design with actual uboot and tooling

submodule of avionic design uboot bootloader and with included tools to
get you started , read readme.md and readme-tk1-loader.md

u-boot/board/highbank/highbank.c

@@ -0,0 +1,144 @@
+/*
+ * Copyright 2010-2011 Calxeda, Inc.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <ahci.h>
+#include <netdev.h>
+#include <scsi.h>
+
+#include <linux/sizes.h>
+#include <asm/io.h>
+
+#define HB_AHCI_BASE			0xffe08000
+
+#define HB_SCU_A9_PWR_STATUS		0xfff10008
+#define HB_SREG_A9_PWR_REQ		0xfff3cf00
+#define HB_SREG_A9_BOOT_SRC_STAT	0xfff3cf04
+#define HB_SREG_A9_PWRDOM_STAT		0xfff3cf20
+#define HB_SREG_A15_PWR_CTRL		0xfff3c200
+
+#define HB_PWR_SUSPEND			0
+#define HB_PWR_SOFT_RESET		1
+#define HB_PWR_HARD_RESET		2
+#define HB_PWR_SHUTDOWN			3
+
+#define PWRDOM_STAT_SATA		0x80000000
+#define PWRDOM_STAT_PCI			0x40000000
+#define PWRDOM_STAT_EMMC		0x20000000
+
+#define HB_SCU_A9_PWR_NORMAL		0
+#define HB_SCU_A9_PWR_DORMANT		2
+#define HB_SCU_A9_PWR_OFF		3
+
+DECLARE_GLOBAL_DATA_PTR;
+
+void cphy_disable_overrides(void);
+
+/*
+ * Miscellaneous platform dependent initialisations
+ */
+int board_init(void)
+{
+	icache_enable();
+
+	return 0;
+}
+
+/* We know all the init functions have been run now */
+int board_eth_init(bd_t *bis)
+{
+	int rc = 0;
+
+#ifdef CONFIG_CALXEDA_XGMAC
+	rc += calxedaxgmac_initialize(0, 0xfff50000);
+	rc += calxedaxgmac_initialize(1, 0xfff51000);
+#endif
+	return rc;
+}
+
+#ifdef CONFIG_SCSI_AHCI_PLAT
+void scsi_init(void)
+{
+	u32 reg = readl(HB_SREG_A9_PWRDOM_STAT);
+
+	cphy_disable_overrides();
+	if (reg & PWRDOM_STAT_SATA) {
+		ahci_init((void __iomem *)HB_AHCI_BASE);
+		scsi_scan(1);
+	}
+}
+#endif
+
+#ifdef CONFIG_MISC_INIT_R
+int misc_init_r(void)
+{
+	char envbuffer[16];
+	u32 boot_choice;
+
+	boot_choice = readl(HB_SREG_A9_BOOT_SRC_STAT) & 0xff;
+	sprintf(envbuffer, "bootcmd%d", boot_choice);
+	if (getenv(envbuffer)) {
+		sprintf(envbuffer, "run bootcmd%d", boot_choice);
+		setenv("bootcmd", envbuffer);
+	} else
+		setenv("bootcmd", "");
+
+	return 0;
+}
+#endif
+
+int dram_init(void)
+{
+	gd->ram_size = SZ_512M;
+	return 0;
+}
+
+#if defined(CONFIG_OF_BOARD_SETUP)
+int ft_board_setup(void *fdt, bd_t *bd)
+{
+	static const char disabled[] = "disabled";
+	u32 reg = readl(HB_SREG_A9_PWRDOM_STAT);
+
+	if (!(reg & PWRDOM_STAT_SATA))
+		do_fixup_by_compat(fdt, "calxeda,hb-ahci", "status",
+			disabled, sizeof(disabled), 1);
+
+	if (!(reg & PWRDOM_STAT_EMMC))
+		do_fixup_by_compat(fdt, "calxeda,hb-sdhci", "status",
+			disabled, sizeof(disabled), 1);
+
+	return 0;
+}
+#endif
+
+static int is_highbank(void)
+{
+	uint32_t midr;
+
+	asm volatile ("mrc p15, 0, %0, c0, c0, 0\n" : "=r"(midr));
+
+	return (midr & 0xfff0) == 0xc090;
+}
+
+void reset_cpu(ulong addr)
+{
+	writel(HB_PWR_HARD_RESET, HB_SREG_A9_PWR_REQ);
+	if (is_highbank())
+		writeb(HB_SCU_A9_PWR_OFF, HB_SCU_A9_PWR_STATUS);
+	else
+		writel(0x1, HB_SREG_A15_PWR_CTRL);
+
+	wfi();
+}
+
+/*
+ * turn off the override before transferring control to Linux, since Linux
+ * may not support spread spectrum.
+ */
+void arch_preboot_os(void)
+{
+	cphy_disable_overrides();
+}