Bump RPi 64-bit to U-Boot 2020.07 release to fix RPi 4 8GB boot (#740) (#775)

Unfortunately builds for 32-bit seem to lead to freezes. Conservatively
only update to 2020.07 for 64-bit builds.

Co-authored-by: Malcolm Lashley <mlashley@gmail.com>

Co-authored-by: Malcolm Lashley <mlashley@gmail.com>

buildroot-external/configs/rpi4_64_defconfig

@@ -87,7 +87,7 @@ BR2_TARGET_ROOTFS_SQUASHFS4_LZ4=y
 BR2_TARGET_UBOOT=y
 BR2_TARGET_UBOOT_BUILD_SYSTEM_KCONFIG=y
 BR2_TARGET_UBOOT_CUSTOM_VERSION=y
-BR2_TARGET_UBOOT_CUSTOM_VERSION_VALUE="2020.01"
+BR2_TARGET_UBOOT_CUSTOM_VERSION_VALUE="2020.07"
 BR2_TARGET_UBOOT_BOARD_DEFCONFIG="rpi_4"
 BR2_TARGET_UBOOT_CONFIG_FRAGMENT_FILES="$(BR2_EXTERNAL_HASSOS_PATH)/bootloader/uboot.config $(BR2_EXTERNAL_HASSOS_PATH)/board/raspberrypi/uboot.config"
 BR2_TARGET_UBOOT_BOOT_SCRIPT=y

buildroot-external/patches/uboot/2020.07/0001-CMD-read-string-from-fileinto-env.patch

@@ -0,0 +1,96 @@
+From 040a141f84f2f84bf8be18f85b4cdb34bf066df0 Mon Sep 17 00:00:00 2001
+Message-Id: <040a141f84f2f84bf8be18f85b4cdb34bf066df0.1595086593.git.stefan@agner.ch>
+From: Pascal Vizeli <pvizeli@syshack.ch>
+Date: Sun, 5 Aug 2018 20:43:03 +0000
+Subject: [PATCH 1/1] CMD: read string from fileinto env
+
+Signed-off-by: Pascal Vizeli <pvizeli@syshack.ch>
+---
+ cmd/Kconfig   |  5 +++++
+ cmd/Makefile  |  1 +
+ cmd/fileenv.c | 45 +++++++++++++++++++++++++++++++++++++++++++++
+ 3 files changed, 51 insertions(+)
+ create mode 100644 cmd/fileenv.c
+
+diff --git a/cmd/Kconfig b/cmd/Kconfig
+index 192b3b262f..b44cd64215 100644
+--- a/cmd/Kconfig
++++ b/cmd/Kconfig
+@@ -1388,6 +1388,11 @@ config CMD_SETEXPR
+ 	  Also supports loading the value at a memory location into a variable.
+ 	  If CONFIG_REGEX is enabled, setexpr also supports a gsub function.
+ 
++config CMD_FILEENV
++	bool "fileenv"
++	help
++	   Read a file into memory and store it to env.
++
+ endmenu
+ 
+ menu "Android support commands"
+diff --git a/cmd/Makefile b/cmd/Makefile
+index 974ad48b0a..287887e97f 100644
+--- a/cmd/Makefile
++++ b/cmd/Makefile
+@@ -128,6 +128,7 @@ obj-$(CONFIG_CMD_SF) += sf.o
+ obj-$(CONFIG_CMD_SCSI) += scsi.o disk.o
+ obj-$(CONFIG_CMD_SHA1SUM) += sha1sum.o
+ obj-$(CONFIG_CMD_SETEXPR) += setexpr.o
++obj-$(CONFIG_CMD_FILEENV) += fileenv.o
+ obj-$(CONFIG_CMD_SPI) += spi.o
+ obj-$(CONFIG_CMD_STRINGS) += strings.o
+ obj-$(CONFIG_CMD_SMC) += smccc.o
+diff --git a/cmd/fileenv.c b/cmd/fileenv.c
+new file mode 100644
+index 0000000000..af24d22d0e
+--- /dev/null
++++ b/cmd/fileenv.c
+@@ -0,0 +1,45 @@
++#include <config.h>
++#include <common.h>
++#include <command.h>
++#include <linux/ctype.h>
++
++static char *fs_argv[5];
++
++int do_fileenv(struct cmd_tbl *cmdtp, int flag, int argc, char * const argv[])
++{
++	if (argc < 6)
++		return CMD_RET_USAGE;
++
++	fs_argv[0] = "fatload";
++	fs_argv[1] = argv[1];
++	fs_argv[2] = argv[2];
++	fs_argv[3] = argv[3];
++	fs_argv[4] = argv[4];
++
++	if (do_fat_fsload(cmdtp, 0, 5, fs_argv) != 0)
++		return 1;
++
++	char *addr = (char *)simple_strtoul(argv[3], NULL, 16);
++	size_t size = env_get_hex("filesize", 0);
++
++	// Prepare string
++	addr[size] = 0x00;
++	char *s = addr;
++	while(*s != 0x00) {
++		if (isprint(*s)) {
++			s++;
++		}
++		else {
++			*s = 0x00;
++		}
++	}
++
++	return env_set(argv[5], addr);
++}
++
++U_BOOT_CMD(
++	fileenv, 6, 0, do_fileenv,
++	"Read file and store it into env.",
++	"<interface> <dev:part> <addr> <filename> <envname>\n"
++	"    - Read file from fat32 and store it as env."
++);
+-- 
+2.27.0
+