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/arch/x86/cpu/qemu/Kconfig

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+#
+# Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com>
+#
+# SPDX-License-Identifier:	GPL-2.0+
+#
+
+config QEMU
+	bool
+
+if QEMU
+
+config SYS_CAR_ADDR
+	hex
+	default 0xd0000
+
+config SYS_CAR_SIZE
+	hex
+	default 0x10000
+
+config ACPI_PM1_BASE
+	hex
+	default 0xe400
+	help
+	  ACPI Power Managment 1 (PM1) i/o-mapped base address.
+	  This device is defined in ACPI specification, with 16 bytes in size.
+
+endif

u-boot/arch/x86/cpu/qemu/Makefile

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+#
+# Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com>
+#
+# SPDX-License-Identifier:	GPL-2.0+
+#
+
+ifndef CONFIG_EFI_STUB
+obj-y += car.o dram.o
+endif
+obj-y += qemu.o
+obj-$(CONFIG_QFW) += cpu.o e820.o

u-boot/arch/x86/cpu/qemu/car.S

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+/*
+ * Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <config.h>
+#include <asm/post.h>
+
+.globl car_init
+car_init:
+	/* Save the BIST result */
+	movl	%eax, %ebp
+
+	post_code(POST_CAR_START)
+
+	/*
+	 * Since we know we are running inside emulator,
+	 * we can do nothing here for CAR initialization.
+	 */
+
+	/* Restore the BIST result */
+	movl	%ebp, %eax
+
+	post_code(POST_CAR_CPU_CACHE)
+	jmp	car_init_ret

u-boot/arch/x86/cpu/qemu/cpu.c

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+/*
+ * Copyright (C) 2015, Miao Yan <yanmiaobest@gmail.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <cpu.h>
+#include <dm.h>
+#include <errno.h>
+#include <qfw.h>
+#include <asm/cpu.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+int cpu_qemu_get_desc(struct udevice *dev, char *buf, int size)
+{
+	if (size < CPU_MAX_NAME_LEN)
+		return -ENOSPC;
+
+	cpu_get_name(buf);
+
+	return 0;
+}
+
+static int cpu_qemu_get_count(struct udevice *dev)
+{
+	return qemu_fwcfg_online_cpus();
+}
+
+static const struct cpu_ops cpu_qemu_ops = {
+	.get_desc	= cpu_qemu_get_desc,
+	.get_count	= cpu_qemu_get_count,
+};
+
+static const struct udevice_id cpu_qemu_ids[] = {
+	{ .compatible = "cpu-qemu" },
+	{ }
+};
+
+U_BOOT_DRIVER(cpu_qemu_drv) = {
+	.name		= "cpu_qemu",
+	.id		= UCLASS_CPU,
+	.of_match	= cpu_qemu_ids,
+	.ops		= &cpu_qemu_ops,
+};

u-boot/arch/x86/cpu/qemu/dram.c

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+/*
+ * Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/post.h>
+#include <asm/arch/qemu.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+int dram_init(void)
+{
+	u32 ram;
+
+	outb(HIGH_RAM_ADDR, CMOS_ADDR_PORT);
+	ram = ((u32)inb(CMOS_DATA_PORT)) << 14;
+	outb(LOW_RAM_ADDR, CMOS_ADDR_PORT);
+	ram |= ((u32)inb(CMOS_DATA_PORT)) << 6;
+	ram += 16 * 1024;
+
+	gd->ram_size = ram * 1024;
+	post_code(POST_DRAM);
+
+	return 0;
+}
+
+void dram_init_banksize(void)
+{
+	gd->bd->bi_dram[0].start = 0;
+	gd->bd->bi_dram[0].size = gd->ram_size;
+}
+
+/*
+ * This function looks for the highest region of memory lower than 4GB which
+ * has enough space for U-Boot where U-Boot is aligned on a page boundary.
+ * It overrides the default implementation found elsewhere which simply
+ * picks the end of ram, wherever that may be. The location of the stack,
+ * the relocation address, and how far U-Boot is moved by relocation are
+ * set in the global data structure.
+ */
+ulong board_get_usable_ram_top(ulong total_size)
+{
+	return gd->ram_size;
+}

u-boot/arch/x86/cpu/qemu/e820.c

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+/*
+ * (C) Copyright 2015 Miao Yan <yanmiaobest@gmail.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/e820.h>
+
+unsigned install_e820_map(unsigned max_entries, struct e820entry *entries)
+{
+	entries[0].addr = 0;
+	entries[0].size = ISA_START_ADDRESS;
+	entries[0].type = E820_RAM;
+
+	entries[1].addr = ISA_START_ADDRESS;
+	entries[1].size = ISA_END_ADDRESS - ISA_START_ADDRESS;
+	entries[1].type = E820_RESERVED;
+
+	/*
+	 * since we use memalign(malloc) to allocate high memory for
+	 * storing ACPI tables, we need to reserve them in e820 tables,
+	 * otherwise kernel will reclaim them and data will be corrupted
+	 */
+	entries[2].addr = ISA_END_ADDRESS;
+	entries[2].size = gd->relocaddr - TOTAL_MALLOC_LEN - ISA_END_ADDRESS;
+	entries[2].type = E820_RAM;
+
+	/* for simplicity, reserve entire malloc space */
+	entries[3].addr = gd->relocaddr - TOTAL_MALLOC_LEN;
+	entries[3].size = TOTAL_MALLOC_LEN;
+	entries[3].type = E820_RESERVED;
+
+	entries[4].addr = gd->relocaddr;
+	entries[4].size = gd->ram_size - gd->relocaddr;
+	entries[4].type = E820_RESERVED;
+
+	entries[5].addr = CONFIG_PCIE_ECAM_BASE;
+	entries[5].size = CONFIG_PCIE_ECAM_SIZE;
+	entries[5].type = E820_RESERVED;
+
+	return 6;
+}

u-boot/arch/x86/cpu/qemu/qemu.c

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+/*
+ * Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <pci.h>
+#include <qfw.h>
+#include <asm/irq.h>
+#include <asm/post.h>
+#include <asm/processor.h>
+#include <asm/arch/device.h>
+#include <asm/arch/qemu.h>
+
+static bool i440fx;
+
+#ifdef CONFIG_QFW
+
+/* on x86, the qfw registers are all IO ports */
+#define FW_CONTROL_PORT	0x510
+#define FW_DATA_PORT		0x511
+#define FW_DMA_PORT_LOW	0x514
+#define FW_DMA_PORT_HIGH	0x518
+
+static void qemu_x86_fwcfg_read_entry_pio(uint16_t entry,
+		uint32_t size, void *address)
+{
+	uint32_t i = 0;
+	uint8_t *data = address;
+
+	/*
+	 * writting FW_CFG_INVALID will cause read operation to resume at
+	 * last offset, otherwise read will start at offset 0
+	 *
+	 * Note: on platform where the control register is IO port, the
+	 * endianness is little endian.
+	 */
+	if (entry != FW_CFG_INVALID)
+		outw(cpu_to_le16(entry), FW_CONTROL_PORT);
+
+	/* the endianness of data register is string-preserving */
+	while (size--)
+		data[i++] = inb(FW_DATA_PORT);
+}
+
+static void qemu_x86_fwcfg_read_entry_dma(struct fw_cfg_dma_access *dma)
+{
+	/* the DMA address register is big endian */
+	outl(cpu_to_be32((uint32_t)dma), FW_DMA_PORT_HIGH);
+
+	while (be32_to_cpu(dma->control) & ~FW_CFG_DMA_ERROR)
+		__asm__ __volatile__ ("pause");
+}
+
+static struct fw_cfg_arch_ops fwcfg_x86_ops = {
+	.arch_read_pio = qemu_x86_fwcfg_read_entry_pio,
+	.arch_read_dma = qemu_x86_fwcfg_read_entry_dma
+};
+#endif
+
+static void enable_pm_piix(void)
+{
+	u8 en;
+	u16 cmd;
+
+	/* Set the PM I/O base */
+	pci_write_config32(PIIX_PM, PMBA, CONFIG_ACPI_PM1_BASE | 1);
+
+	/* Enable access to the PM I/O space */
+	pci_read_config16(PIIX_PM, PCI_COMMAND, &cmd);
+	cmd |= PCI_COMMAND_IO;
+	pci_write_config16(PIIX_PM, PCI_COMMAND, cmd);
+
+	/* PM I/O Space Enable (PMIOSE) */
+	pci_read_config8(PIIX_PM, PMREGMISC, &en);
+	en |= PMIOSE;
+	pci_write_config8(PIIX_PM, PMREGMISC, en);
+}
+
+static void enable_pm_ich9(void)
+{
+	/* Set the PM I/O base */
+	pci_write_config32(ICH9_PM, PMBA, CONFIG_ACPI_PM1_BASE | 1);
+}
+
+static void qemu_chipset_init(void)
+{
+	u16 device, xbcs;
+	int pam, i;
+
+	/*
+	 * i440FX and Q35 chipset have different PAM register offset, but with
+	 * the same bitfield layout. Here we determine the offset based on its
+	 * PCI device ID.
+	 */
+	pci_read_config16(PCI_BDF(0, 0, 0), PCI_DEVICE_ID, &device);
+	i440fx = (device == PCI_DEVICE_ID_INTEL_82441);
+	pam = i440fx ? I440FX_PAM : Q35_PAM;
+
+	/*
+	 * Initialize Programmable Attribute Map (PAM) Registers
+	 *
+	 * Configure legacy segments C/D/E/F to system RAM
+	 */
+	for (i = 0; i < PAM_NUM; i++)
+		pci_write_config8(PCI_BDF(0, 0, 0), pam + i, PAM_RW);
+
+	if (i440fx) {
+		/*
+		 * Enable legacy IDE I/O ports decode
+		 *
+		 * Note: QEMU always decode legacy IDE I/O port on PIIX chipset.
+		 * However Linux ata_piix driver does sanity check on these two
+		 * registers to see whether legacy ports decode is turned on.
+		 * This is to make Linux ata_piix driver happy.
+		 */
+		pci_write_config16(PIIX_IDE, IDE0_TIM, IDE_DECODE_EN);
+		pci_write_config16(PIIX_IDE, IDE1_TIM, IDE_DECODE_EN);
+
+		/* Enable I/O APIC */
+		pci_read_config16(PIIX_ISA, XBCS, &xbcs);
+		xbcs |= APIC_EN;
+		pci_write_config16(PIIX_ISA, XBCS, xbcs);
+
+		enable_pm_piix();
+	} else {
+		/* Configure PCIe ECAM base address */
+		pci_write_config32(PCI_BDF(0, 0, 0), PCIEX_BAR,
+				   CONFIG_PCIE_ECAM_BASE | BAR_EN);
+
+		enable_pm_ich9();
+	}
+
+#ifdef CONFIG_QFW
+	qemu_fwcfg_init(&fwcfg_x86_ops);
+#endif
+}
+
+int arch_cpu_init(void)
+{
+	int ret;
+
+	post_code(POST_CPU_INIT);
+
+	ret = x86_cpu_init_f();
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+#ifndef CONFIG_EFI_STUB
+int print_cpuinfo(void)
+{
+	post_code(POST_CPU_INFO);
+	return default_print_cpuinfo();
+}
+#endif
+
+void reset_cpu(ulong addr)
+{
+	/* cold reset */
+	x86_full_reset();
+}
+
+int arch_early_init_r(void)
+{
+	qemu_chipset_init();
+
+	return 0;
+}
+
+#ifdef CONFIG_GENERATE_MP_TABLE
+int mp_determine_pci_dstirq(int bus, int dev, int func, int pirq)
+{
+	u8 irq;
+
+	if (i440fx) {
+		/*
+		 * Not like most x86 platforms, the PIRQ[A-D] on PIIX3 are not
+		 * connected to I/O APIC INTPIN#16-19. Instead they are routed
+		 * to an irq number controled by the PIRQ routing register.
+		 */
+		pci_read_config8(PCI_BDF(bus, dev, func),
+				 PCI_INTERRUPT_LINE, &irq);
+	} else {
+		/*
+		 * ICH9's PIRQ[A-H] are not consecutive numbers from 0 to 7.
+		 * PIRQ[A-D] still maps to [0-3] but PIRQ[E-H] maps to [8-11].
+		 */
+		irq = pirq < 8 ? pirq + 16 : pirq + 12;
+	}
+
+	return irq;
+}
+#endif