Add uinit.go init script for winterfell board. This is setting up the basic

storage drivers to boot locally (ATA and NVME) and kick the RSDP

boards/winterfell/uinit.go

@@ -0,0 +1,44 @@
+// Copyright 2012-2017 the u-root Authors. All rights reserved
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// This is winterfell init script
+package main
+
+import (
+	"log"
+	"os"
+	"os/exec"
+	"strings"
+)
+
+var (
+	commands = []string{
+		"/bbin/insmod /lib/modules/nvme-core.ko",
+		"/bbin/insmod /lib/modules/nvme.ko",
+		"/bbin/insmod /lib/modules/libata.ko",
+		"/bbin/insmod /lib/modules/libahci.ko",
+		"/bbin/insmod /lib/modules/ahci.ko",
+		"/bbin/rsdp",
+	}
+)
+
+func main() {
+	for _, line := range commands {
+		log.Printf("Executing Command: %v", line)
+		cmdSplit := strings.Split(line, " ")
+		if len(cmdSplit) == 0 {
+			continue
+		}
+
+		cmd := exec.Command(cmdSplit[0], cmdSplit[1:]...)
+		cmd.Stdin = os.Stdin
+		cmd.Stderr = os.Stderr
+		cmd.Stdout = os.Stdout
+		if err := cmd.Run(); err != nil {
+			log.Print(err)
+		}
+
+	}
+	log.Print("Uinit Done!")
+}

modules/u-root

@@ -7,11 +7,13 @@
 
 u-root_url := github.com/u-root/u-root
 u-root_output := $(build)/$(BOARD)/u-root.cpio
+UROOT_CMDS ?=
 ifeq ($(shell test -e build/$(BOARD)/u-root.cpio && echo -n yes),yes)
 $(shell rm $(build)/$(BOARD)/u-root.cpio)
 endif
 
 export GOPATH=$(build)/go
+src_cmds := $(foreach cmd,$(UROOT_CMDS),github.com/u-root/u-root/cmds/$(cmd))
 
 $(GOPATH):
 	$(call do,GO GET,$(u-root_url),\
@@ -19,11 +21,18 @@ $(GOPATH):
 	)
 
 $(u-root_output): $(GOPATH)
+ifeq ($(shell test -e boards/$(BOARD)/uinit.go && echo -n yes),yes)
+ifeq ($(shell (test -d $(GOPATH)/src/github.com/u-root/u-root/cmds/uinit || echo -n yes)),yes)
+	mkdir $(GOPATH)/src/github.com/u-root/u-root/cmds/uinit
+endif
+	cp boards/$(BOARD)/uinit.go $(GOPATH)/src/github.com/u-root/u-root/cmds/uinit
+endif
 	$(call do,U-ROOT,$@,\
 		$(GOPATH)/bin/u-root \
 			-build=bb \
 			-format=cpio \
-			-o $@ \
+			-o $@  \
+			$(src_cmds)\
 	)
 
 # Override the initrd inputs and add in the kernel modules