booting Beaglebone Black

Index: distrib/utils/embedded/files/armv7_boot.cmd
===================================================================
RCS file: /cvsroot/src/distrib/utils/embedded/files/armv7_boot.cmd,v
retrieving revision 1.15
diff -u -r1.15 armv7_boot.cmd
--- distrib/utils/embedded/files/armv7_boot.cmd	27 Oct 2019 21:38:58 -0000	1.15
+++ distrib/utils/embedded/files/armv7_boot.cmd	23 Jun 2024 22:05:14 -0000
@@ -1,8 +1,85 @@
+# $NetBSD$
+#
+# U-Boot boot script
+
+# This file is typically loaded and run early in the U-Boot boot
+# process.  As a result, it has the opportunity to boot a kernel
+# immediately, change the U-Boot environment, or otherwise affect the
+# boot process.  Good practice is to modify the U-Boot environment to
+# prevent recursion.  Additionally, the contents of this file should
+# be consistent with the U-Boot process of booting, which in brief is
+# the following.
+
+# U-Boot first initializes the board and creates the environment,
+# which contains both variables describing the specific board and boot
+# parameters, as well as variables containing commands to be run.  One
+# of these, bootcmd, is the entry point for automatic booting after a
+# timeout occurs.  Although bootcmd can be redefined, e.g., either at
+# compile time in the board-specific configuration file or at runtime
+# via the console, the default definition generally defines additional
+# environment variables and selects a method of booting a kernel.
+#
+# After initialization, the file boot.scr, which is created by
+# mkubootimage(1) from this file (see ../conf/armv7.conf), is loaded
+# and run if it exists.  If boot.scr returns, then if it exists the
+# file uEnv.txt, which contains a set of key=value pairs, is loaded
+# into the environment.  Next, if the environment variable uenvcmd is
+# not empty, it is run; this provides an opportunity for uEnv.txt to
+# define an alternate boot command.  Finally, the environment command
+# distro_bootcmd is run, which iterates through a series of boot
+# options to boot a kernel.  The set of boot options can be modified
+# by removing or redefining various boot_* or other environment
+# variables in either boot.scr or uEnv.txt.
+#
+# NetBSD uses UEFI (e.g., bootaa64.efi or bootarm.efi) to boot most
+# aarch64 and arm embedded platforms.  Any boards, e.g., am335x, that
+# cannot boot via UEFI are handled specially here.
+#
+
+if test "${soc}" = "am33xx" ; then
+	setenv kernel "netbsd-GENERIC.ub"
+	setenv bootargs "root=ld0a"
+	setenv dtbdir "dtb"
+	setenv fdtodir "overlays"
+	setenv fdto_addr_r 0x83000000
+	setenv bootpart 0:1
+	setenv use_fdt 1
+else
+	setenv use_efi 1
+fi
+
 if test "${soc}" = "tegra210" ; then
 	# enable PCIe
 	pci enum
 fi
 
-setenv boot_scripts
-setenv boot_script_dhcp
-run distro_bootcmd
+if test "${use_efi}" = "1" ; then
+	# prevent recursion, but continue boot process
+	setenv boot_scripts
+	setenv boot_script_dhcp
+	run distro_bootcmd
+else
+	# boot non-UEFI boards immediately
+	if test "${use_fdt}" = "1" ; then
+		if run loadbootenv; then
+			echo Loaded env from ${bootenvfile}
+			echo env import -t ${loadaddr} ${filesize}
+			run importbootenv
+		fi
+		load mmc ${mmcdev}:${mmcpart} ${kernel_addr_r} ${kernel}
+		load mmc ${mmcdev}:${mmcpart} ${fdt_addr_r} ${dtbdir}/${fdtfile}
+		fdt addr ${fdt_addr_r}
+		fdt resize 8192
+		for f in ${overlays}; do
+			echo Loading fdt overlay ${fdtodir}/${f}
+			load mmc ${mmcdev}:${mmcpart} ${fdto_addr_r} ${fdtodir}/${f}
+			fdt apply ${fdto_addr_r}
+		done
+		echo Booting NetBSD: ${kernel} ${bootargs} ${dtbdir}/${fdtfile} ...
+		bootm ${kernel_addr_r} - ${fdt_addr_r}
+	else
+		load mmc ${mmcdev}:${mmcpart} ${kernel_addr_r} ${kernel}
+		echo Booting NetBSD: ${kernel} ${bootargs} ...
+		bootm ${kernel_addr_r} ${bootargs}
+	fi
+fi