From 311fd299f68ce07503e77066291cb107e6c465b3 Mon Sep 17 00:00:00 2001
From: Natanael Copa <ncopa@alpinelinux.org>
Date: Fri, 13 Mar 2009 18:27:35 +0000
Subject: [PATCH] add support to boot from usb

---
 alpine.mk      | 2 +-
 initramfs-init | 8 +++++++-
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/alpine.mk b/alpine.mk
index db9f14b..0bb69f1 100755
--- a/alpine.mk
+++ b/alpine.mk
@@ -249,7 +249,7 @@ $(SYSLINUX_CFG):
 	@echo "default $(KERNEL_NAME)" >>$@
 	@echo "label $(KERNEL_NAME)" >>$@
 	@echo "	kernel /boot/$(KERNEL_NAME)" >>$@
-	@echo "	append initrd=/boot/$(KERNEL_NAME).gz alpine_dev=sda1:vfat quiet" >>$@
+	@echo "	append initrd=/boot/$(KERNEL_NAME).gz alpine_dev=sda1:vfat modules=usb-storage,sd-mod quiet" >>$@
 
 ISO_KERNEL	:= $(ISO_DIR)/boot/$(KERNEL_NAME)
 ISO_PKGDIR	:= $(ISO_DIR)/packages
diff --git a/initramfs-init b/initramfs-init
index b427de3..b0a8a75 100755
--- a/initramfs-init
+++ b/initramfs-init
@@ -133,8 +133,14 @@ mkdir -p $ALPINE_MNT
 if [ -n "$ALPINE_DEV_FS" ]; then
 	mount_opts="-t $ALPINE_DEV_FS"
 fi
-mount $mount_opts /dev/$ALPINE_DEV $ALPINE_MNT >/dev/null 2>&1
+
+# usb might need some time to settle so we retry a few times
+for i in $(seq 0 19); do
+	mount $mount_opts /dev/$ALPINE_DEV $ALPINE_MNT >/dev/null 2>&1 && break
+	sleep 1
+done
 eend $?
+
 ebegin "Mounting loopback device for kernel modules"
 modprobe loop
 if [ -n "$KOPT_modloop" ]; then