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/xes/xpedite1000/xpedite1000.c

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+/*
+ * Copyright (C) 2003 Travis B. Sawyer <travis.sawyer@sandburst.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <console.h>
+#include <asm/processor.h>
+#include <spd_sdram.h>
+#include <i2c.h>
+#include <net.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+int board_early_init_f(void)
+{
+	unsigned long sdrreg;
+
+	/*
+	 * Enable GPIO for pins 18 - 24
+	 * 18 = SEEPROM_WP
+	 * 19 = #M_RST
+	 * 20 = #MONARCH
+	 * 21 = #LED_ALARM
+	 * 22 = #LED_ACT
+	 * 23 = #LED_STATUS1
+	 * 24 = #LED_STATUS2
+	 */
+	mfsdr(SDR0_PFC0, sdrreg);
+	mtsdr(SDR0_PFC0, (sdrreg & ~SDR0_PFC0_TRE_ENABLE) | 0x00003e00);
+	out32(CONFIG_SYS_GPIO_BASE + 0x018, (USR_LED0 | USR_LED1 | USR_LED2 | USR_LED3));
+	LED0_OFF();
+	LED1_OFF();
+	LED2_OFF();
+	LED3_OFF();
+
+	/* Setup the external bus controller/chip selects */
+	mtebc(PB0AP, 0x04055200);	/* 16MB Strata FLASH */
+	mtebc(PB0CR, 0xff098000);	/* BAS=0xff0 16MB R/W 8-bit */
+	mtebc(PB1AP, 0x04055200);	/* 512KB Socketed AMD FLASH */
+	mtebc(PB1CR, 0xfe018000);	/* BAS=0xfe0 1MB R/W 8-bit */
+	mtebc(PB6AP, 0x05006400);	/* 32-64MB AMD MirrorBit FLASH */
+	mtebc(PB6CR, 0xf00da000);	/* BAS=0xf00 64MB R/W i6-bit */
+	mtebc(PB7AP, 0x05006400);	/* 32-64MB AMD MirrorBit FLASH */
+	mtebc(PB7CR, 0xf40da000);	/* BAS=0xf40 64MB R/W 16-bit */
+
+	/*
+	 * Setup the interrupt controller polarities, triggers, etc.
+	 *
+	 * Because of the interrupt handling rework to handle 440GX interrupts
+	 * with the common code, we needed to change names of the UIC registers.
+	 * Here the new relationship:
+	 *
+	 * U-Boot name	440GX name
+	 * -----------------------
+	 * UIC0		UICB0
+	 * UIC1		UIC0
+	 * UIC2		UIC1
+	 * UIC3		UIC2
+	 */
+	mtdcr(UIC1SR, 0xffffffff);	/* clear all */
+	mtdcr(UIC1ER, 0x00000000);	/* disable all */
+	mtdcr(UIC1CR, 0x00000003);	/* SMI & UIC1 crit are critical */
+	mtdcr(UIC1PR, 0xfffffe00);	/* per ref-board manual */
+	mtdcr(UIC1TR, 0x01c00000);	/* per ref-board manual */
+	mtdcr(UIC1VR, 0x00000001);	/* int31 highest, base=0x000 */
+	mtdcr(UIC1SR, 0xffffffff);	/* clear all */
+
+	mtdcr(UIC2SR, 0xffffffff);	/* clear all */
+	mtdcr(UIC2ER, 0x00000000);	/* disable all */
+	mtdcr(UIC2CR, 0x00000000);	/* all non-critical */
+	mtdcr(UIC2PR, 0xffffc0ff);	/* per ref-board manual */
+	mtdcr(UIC2TR, 0x00ff8000);	/* per ref-board manual */
+	mtdcr(UIC2VR, 0x00000001);	/* int31 highest, base=0x000 */
+	mtdcr(UIC2SR, 0xffffffff);	/* clear all */
+
+	mtdcr(UIC3SR, 0xffffffff);	/* clear all */
+	mtdcr(UIC3ER, 0x00000000);	/* disable all */
+	mtdcr(UIC3CR, 0x00000000);	/* all non-critical */
+	mtdcr(UIC3PR, 0xffffffff);	/* per ref-board manual */
+	mtdcr(UIC3TR, 0x00ff8c0f);	/* per ref-board manual */
+	mtdcr(UIC3VR, 0x00000001);	/* int31 highest, base=0x000 */
+	mtdcr(UIC3SR, 0xffffffff);	/* clear all */
+
+	mtdcr(UIC0SR, 0xfc000000);	/* clear all */
+	mtdcr(UIC0ER, 0x00000000);	/* disable all */
+	mtdcr(UIC0CR, 0x00000000);	/* all non-critical */
+	mtdcr(UIC0PR, 0xfc000000);	/* */
+	mtdcr(UIC0TR, 0x00000000);	/* */
+	mtdcr(UIC0VR, 0x00000001);	/* */
+
+	LED0_ON();
+
+	return 0;
+}
+
+int checkboard(void)
+{
+	char buf[64];
+	int i;
+
+	printf("Board: X-ES %s PMC SBC\n", CONFIG_SYS_BOARD_NAME);
+	printf("       ");
+	i = getenv_f("board_rev", buf, sizeof(buf));
+	if (i > 0)
+		printf("Rev %s, ", buf);
+	i = getenv_f("serial#", buf, sizeof(buf));
+	if (i > 0)
+		printf("Serial# %s, ", buf);
+	i = getenv_f("board_cfg", buf, sizeof(buf));
+	if (i > 0)
+		printf("Cfg %s", buf);
+	printf("\n");
+
+	return 0;
+}
+
+phys_size_t initdram(int board_type)
+{
+	return spd_sdram();
+}
+
+/*
+ * Override weak pci_pre_init()
+ *
+ * This routine is called just prior to registering the hose and gives
+ * the board the opportunity to check things. Returning a value of zero
+ * indicates that things are bad & PCI initialization should be aborted.
+ *
+ * Different boards may wish to customize the pci controller structure
+ * (add regions, override default access routines, etc) or perform
+ * certain pre-initialization actions.
+ */
+#if defined(CONFIG_PCI)
+int pci_pre_init(struct pci_controller * hose)
+{
+	unsigned long strap;
+
+	/* See if we're supposed to setup the pci */
+	mfsdr(SDR0_SDSTP1, strap);
+	if ((strap & 0x00010000) == 0)
+		return 0;
+
+#if defined(CONFIG_SYS_PCI_FORCE_PCI_CONV)
+	/* Setup System Device Register PCIL0_XCR */
+	mfsdr(SDR0_XCR, strap);
+	strap &= 0x0f000000;
+	mtsdr(SDR0_XCR, strap);
+#endif
+
+	return 1;
+}
+#endif /* defined(CONFIG_PCI) */
+
+#if defined(CONFIG_PCI)
+/*
+ * Override weak is_pci_host()
+ *
+ * This routine is called to determine if a pci scan should be
+ * performed. With various hardware environments (especially cPCI and
+ * PPMC) it's insufficient to depend on the state of the arbiter enable
+ * bit in the strap register, or generic host/adapter assumptions.
+ *
+ * Rather than hard-code a bad assumption in the general 440 code, the
+ * 440 pci code requires the board to decide at runtime.
+ *
+ * Return 0 for adapter mode, non-zero for host (monarch) mode.
+ */
+int is_pci_host(struct pci_controller *hose)
+{
+	return ((in32(CONFIG_SYS_GPIO_BASE + 0x1C) & 0x00000800) == 0);
+}
+#endif /* defined(CONFIG_PCI) */
+
+#ifdef CONFIG_POST
+/*
+ * Returns 1 if keys pressed to start the power-on long-running tests
+ * Called from board_init_f().
+ */
+int post_hotkeys_pressed(void)
+{
+	return ctrlc();
+}
+#endif