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/fsp/fsp_car.S

@@ -0,0 +1,110 @@
+/*
+ * Copyright (C) 2014, Bin Meng <bmeng.cn@gmail.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <config.h>
+#include <asm/post.h>
+
+.globl car_init
+car_init:
+	/*
+	 * Note: ebp holds the BIST value (built-in self test) so far, but ebp
+	 * will be destroyed through the FSP call, thus we have to test the
+	 * BIST value here before we call into FSP.
+	 */
+	test	%ebp, %ebp
+	jz	car_init_start
+	post_code(POST_BIST_FAILURE)
+	jmp	die
+
+car_init_start:
+	post_code(POST_CAR_START)
+	lea	find_fsp_header_romstack, %esp
+	jmp	find_fsp_header
+
+find_fsp_header_ret:
+	/* EAX points to FSP_INFO_HEADER */
+	mov	%eax, %ebp
+
+	/* sanity test */
+	cmp	$CONFIG_FSP_ADDR, %eax
+	jb	die
+
+	/* calculate TempRamInitEntry address */
+	mov	0x30(%ebp), %eax
+	add	0x1c(%ebp), %eax
+
+	/* call FSP TempRamInitEntry to setup temporary stack */
+	lea	temp_ram_init_romstack, %esp
+	jmp	*%eax
+
+temp_ram_init_ret:
+	addl	$4, %esp
+	cmp	$0, %eax
+	jnz	car_init_fail
+
+	post_code(POST_CAR_CPU_CACHE)
+
+	/*
+	 * The FSP TempRamInit initializes the ecx and edx registers to
+	 * point to a temporary but writable memory range (Cache-As-RAM).
+	 * ecx: the start of this temporary memory range,
+	 * edx: the end of this range.
+	 */
+
+	/* stack grows down from top of CAR */
+	movl	%edx, %esp
+	subl	$4, %esp
+
+	xor	%esi, %esi
+	jmp	car_init_done
+
+.global fsp_init_done
+fsp_init_done:
+	/*
+	 * We come here from fsp_continue() with eax pointing to the HOB list.
+	 * Save eax to esi temporarily.
+	 */
+	movl	%eax, %esi
+
+car_init_done:
+	/*
+	 * Re-initialize the ebp (BIST) to zero, as we already reach here
+	 * which means we passed BIST testing before.
+	 */
+	xorl	%ebp, %ebp
+	jmp	car_init_ret
+
+car_init_fail:
+	post_code(POST_CAR_FAILURE)
+
+die:
+	hlt
+	jmp	die
+	hlt
+
+	/*
+	 * The function call before CAR initialization is tricky. It cannot
+	 * be called using the 'call' instruction but only the 'jmp' with
+	 * the help of a handcrafted stack in the ROM. The stack needs to
+	 * contain the function return address as well as the parameters.
+	 */
+	.balign	4
+find_fsp_header_romstack:
+	.long	find_fsp_header_ret
+
+	.balign	4
+temp_ram_init_romstack:
+	.long	temp_ram_init_ret
+	.long	temp_ram_init_params
+temp_ram_init_params:
+_dt_ucode_base_size:
+	/* These next two fields are filled in by ifdtool */
+.globl ucode_base
+ucode_base:	/* Declared in micrcode.h */
+	.long	0			/* microcode base */
+	.long	0			/* microcode size */
+	.long	CONFIG_SYS_MONITOR_BASE	/* code region base */
+	.long	CONFIG_SYS_MONITOR_LEN	/* code region size */