initial buildroot for linux 5.15

boot/afboot-stm32/0001-Pass-fno-builtin-to-fix-build-with-gcc-10.patch

@@ -0,0 +1,46 @@
+From 5448f328ff63a6ca4a64519c2f1dfc63a33df4b7 Mon Sep 17 00:00:00 2001
+From: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
+Date: Thu, 10 Sep 2020 11:37:33 +0200
+Subject: [PATCH] Pass -fno-builtin to fix build with gcc 10
+
+gcc 10, if it recognizes some hand-written code that looks like
+memcpy, will generate a call to memcpy().
+
+For example:
+
+        while (dst < &_end_data) {
+                *dst++ = *src++;
+        }
+
+gets recognized as such. However, in the context of bare-metal code,
+having a call to memcpy() in the C library doesn't work. So we fix
+that by disabling builtins.
+
+Fixes:
+
+/home/thomas/projets/buildroot/output/host/opt/ext-toolchain/bin/../arm-buildroot-uclinux-uclibcgnueabi/bin/ld.real: stm32f429i-disco.o: in function `reset':
+stm32f429i-disco.c:(.text.reset+0x1a): undefined reference to `memcpy'
+/home/thomas/projets/buildroot/output/host/opt/ext-toolchain/bin/../arm-buildroot-uclinux-uclibcgnueabi/bin/ld.real: stm32f429i-disco.c:(.text.reset+0x34): undefined reference to `memset'
+make[1]: *** [Makefile:26: stm32f429i-disco] Error 1
+
+Upstream: https://github.com/mcoquelin-stm32/afboot-stm32/pull/9
+Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
+---
+ Makefile | 1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/Makefile b/Makefile
+index f699176..1e8557d 100644
+--- a/Makefile
++++ b/Makefile
+@@ -13,6 +13,7 @@ DTB_ADDR?=0x08004000
+ CFLAGS := -mthumb -mcpu=cortex-m4
+ CFLAGS += -ffunction-sections -fdata-sections
+ CFLAGS += -Os -std=gnu99 -Wall
++CFLAGS += -fno-builtin
+ LINKERFLAGS := -nostartfiles --gc-sections
+ 
+ obj-y += gpio.o mpu.o qspi.o start_kernel.o
+-- 
+2.26.2
+

boot/afboot-stm32/Config.in

@@ -0,0 +1,7 @@
+config BR2_TARGET_AFBOOT_STM32
+	bool "afboot-stm32"
+	depends on BR2_arm
+	help
+	  afboot-stm32 is a very small bootloader for STM32 platforms
+
+	  https://github.com/mcoquelin-stm32/afboot-stm32

boot/afboot-stm32/afboot-stm32.hash

@@ -0,0 +1,2 @@
+# Locally calculated
+sha256 9b37b661bd3091ceb5d8dc5a56a2dfc02ae9ebc0c63dad3c4289c9d6b3d3ec89  afboot-stm32-0.2.tar.gz

boot/afboot-stm32/afboot-stm32.mk

@@ -0,0 +1,20 @@
+################################################################################
+#
+# afboot-stm32
+#
+################################################################################
+
+AFBOOT_STM32_VERSION = 0.2
+AFBOOT_STM32_SITE = $(call github,mcoquelin-stm32,afboot-stm32,v$(AFBOOT_STM32_VERSION))
+AFBOOT_STM32_INSTALL_IMAGES = YES
+AFBOOT_STM32_INSTALL_TARGET = NO
+
+define AFBOOT_STM32_BUILD_CMDS
+	$(TARGET_MAKE_ENV) $(MAKE) -C $(@D) CROSS_COMPILE=$(TARGET_CROSS) all
+endef
+
+define AFBOOT_STM32_INSTALL_IMAGES_CMDS
+	$(INSTALL) -m 0755 -t $(BINARIES_DIR) -D $(@D)/stm32*.bin
+endef
+
+$(eval $(generic-package))