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/lib/efi/efi.c

@@ -0,0 +1,151 @@
+/*
+ * Copyright (c) 2015 Google, Inc
+ * Written by Simon Glass <sjg@chromium.org>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <debug_uart.h>
+#include <efi.h>
+#include <errno.h>
+#include <linux/err.h>
+#include <linux/types.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/*
+ * 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)
+{
+	struct efi_mem_desc *desc, *end;
+	struct efi_entry_memmap *map;
+	int ret, size;
+	uintptr_t dest_addr = 0;
+	struct efi_mem_desc *largest = NULL;
+
+	/*
+	 * Find largest area of memory below 4GB. We could
+	 * call efi_build_mem_table() for a more accurate picture since it
+	 * merges areas together where possible. But that function uses more
+	 * pre-relocation memory, and it's not critical that we find the
+	 * absolute largest region.
+	 */
+	ret = efi_info_get(EFIET_MEMORY_MAP, (void **)&map, &size);
+	if (ret) {
+		/* We should have stopped in dram_init(), something is wrong */
+		debug("%s: Missing memory map\n", __func__);
+		goto err;
+	}
+
+	end = (struct efi_mem_desc *)((ulong)map + size);
+	desc = map->desc;
+	for (; desc < end; desc = efi_get_next_mem_desc(map, desc)) {
+		if (desc->type != EFI_CONVENTIONAL_MEMORY ||
+		    desc->physical_start >= 1ULL << 32)
+			continue;
+		if (!largest || desc->num_pages > largest->num_pages)
+			largest = desc;
+	}
+
+	/* If no suitable area was found, return an error. */
+	assert(largest);
+	if (!largest || (largest->num_pages << EFI_PAGE_SHIFT) < (2 << 20))
+		goto err;
+
+	dest_addr = largest->physical_start + (largest->num_pages <<
+			EFI_PAGE_SHIFT);
+
+	return (ulong)dest_addr;
+err:
+	panic("No available memory found for relocation");
+	return 0;
+}
+
+int dram_init(void)
+{
+	struct efi_mem_desc *desc, *end;
+	struct efi_entry_memmap *map;
+	int size, ret;
+
+	ret = efi_info_get(EFIET_MEMORY_MAP, (void **)&map, &size);
+	if (ret) {
+		printf("Cannot find EFI memory map tables, ret=%d\n", ret);
+
+		return -ENODEV;
+	}
+
+	end = (struct efi_mem_desc *)((ulong)map + size);
+	gd->ram_size = 0;
+	desc = map->desc;
+	for (; desc < end; desc = efi_get_next_mem_desc(map, desc)) {
+		if (desc->type < EFI_MMAP_IO)
+			gd->ram_size += desc->num_pages << EFI_PAGE_SHIFT;
+	}
+
+	return 0;
+}
+
+void dram_init_banksize(void)
+{
+	struct efi_mem_desc *desc, *end;
+	struct efi_entry_memmap *map;
+	int ret, size;
+	int num_banks;
+
+	ret = efi_info_get(EFIET_MEMORY_MAP, (void **)&map, &size);
+	if (ret) {
+		/* We should have stopped in dram_init(), something is wrong */
+		debug("%s: Missing memory map\n", __func__);
+		return;
+	}
+	end = (struct efi_mem_desc *)((ulong)map + size);
+	desc = map->desc;
+	for (num_banks = 0;
+	     desc < end && num_banks < CONFIG_NR_DRAM_BANKS;
+	     desc = efi_get_next_mem_desc(map, desc)) {
+		/*
+		 * We only use conventional memory below 4GB, and ignore
+		 * anything less than 1MB.
+		 */
+		if (desc->type != EFI_CONVENTIONAL_MEMORY ||
+		    desc->physical_start >= 1ULL << 32 ||
+		    (desc->num_pages << EFI_PAGE_SHIFT) < 1 << 20)
+			continue;
+		gd->bd->bi_dram[num_banks].start = desc->physical_start;
+		gd->bd->bi_dram[num_banks].size = desc->num_pages <<
+			EFI_PAGE_SHIFT;
+		num_banks++;
+	}
+}
+
+int print_cpuinfo(void)
+{
+	return default_print_cpuinfo();
+}
+
+/* Find any available tables and copy them to a safe place */
+int reserve_arch(void)
+{
+	struct efi_info_hdr *hdr;
+
+	debug("table=%lx\n", gd->arch.table);
+	if (!gd->arch.table)
+		return 0;
+
+	hdr = (struct efi_info_hdr *)gd->arch.table;
+
+	gd->start_addr_sp -= hdr->total_size;
+	memcpy((void *)gd->start_addr_sp, hdr, hdr->total_size);
+	debug("Stashing EFI table at %lx to %lx, size %x\n",
+	      gd->arch.table, gd->start_addr_sp, hdr->total_size);
+	gd->arch.table = gd->start_addr_sp;
+
+	return 0;
+}