initial buildroot for linux 5.15

package/memtest86/Config.in

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+config BR2_PACKAGE_MEMTEST86
+	bool "memtest86"
+	depends on BR2_i386 || BR2_x86_64
+	help
+	  Memtest86+ is a bootable standalone memory test program.
+
+	  Buildroot does not support packages with a '+' sign in their
+	  name, which explains why it is named memtest86 and not
+	  memtest86+.
+
+	  Memtest86+ is a utility designed to test whether your memory
+	  is in working order. It repeatedly writes an enormous amount
+	  of different patterns to all memory locations and reads them
+	  back again and verifies whether the result of the read is the
+	  same as what was written to memory.
+
+	  Memtest86+ will only work on 32-bit or 64-bit x86 targets.
+	  It boots as an i486 program and autodetects hardware. It can
+	  be added to the grub2 boot menu by adding the following
+	  lines to the bottom of /boot/grub/grub.cfg - note the use of
+	  linux16.
+
+	  menuentry "Memtest86+" {
+	    linux16 /boot/memtest86+.bin
+	  }
+
+	  Other boot loaders will have similar requirements.
+
+	  http://www.memtest.org

package/memtest86/memtest86.hash

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+# locally computed using sha256sum
+sha256  142127b7953fbd829b1057fb64a78d3340c2b771484230a7347e94530a0d9039  memtest86+-5.01.tar.gz
+sha256  2e15e2174b86640d7fbfcb62b51d9182062d9db71d66a46e5b01d736c68150ea  README

package/memtest86/memtest86.mk

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+################################################################################
+#
+# memtest86
+#
+################################################################################
+
+MEMTEST86_VERSION = 5.01
+MEMTEST86_SOURCE = memtest86+-$(MEMTEST86_VERSION).tar.gz
+MEMTEST86_SITE = http://www.memtest.org/download/$(MEMTEST86_VERSION)
+MEMTEST86_LICENSE = GPL-2.0
+MEMTEST86_LICENSE_FILES = README
+
+# memtest86+ is sensitive to toolchain changes, use the shipped binary version
+define MEMTEST86_INSTALL_TARGET_CMDS
+	$(INSTALL) -m 0755 -D $(@D)/precomp.bin $(TARGET_DIR)/boot/memtest86+.bin
+endef
+
+$(eval $(generic-package))