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kernel: set root on NFS when enabled 

Replace the configured root device with a NFS root device and automatic
IP configuration for booting over NFS.

Signed-off-by: Florian Fainelli <florian@openwrt.org>

SVN-Revision: 48591
This commit is contained in:
Florian Fainelli 2016-02-01 01:06:56 +00:00
parent 312367665a
commit d9fab87607
1 changed files with 13 additions and 0 deletions
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13
include/kernel-defaults.mk
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@ -104,6 +104,18 @@ define Kernel/SetNoInitramfs
echo 'CONFIG_INITRAMFS_SOURCE=""' >> $(LINUX_DIR)/.config.set
endef
ifeq ($(CONFIG_KERNEL_ROOT_NFS),y)
define Kernel/SetNfsCmdline
rm -f $(LINUX_DIR)/.config.prev
mv $(LINUX_DIR)/.config $(LINUX_DIR)/.config.old
grep -v "CONFIG_CMDLINE=" $(LINUX_DIR)/.config.old > $(LINUX_DIR)/.config
grep "CONFIG_CMDLINE=" $(LINUX_DIR)/.config.old | cut -d\" -f2 | sed 's/root=\/dev\/\([a-z0-9]*\)\(.*\)/CONFIG_CMDLINE=\"root=\/dev\/nfs ip=dhcp\2\"/' >> $(LINUX_DIR)/.config
endef
else
define Kernel/SetNfsCmdline
endef
endif
define Kernel/Configure/Default
$(LINUX_CONF_CMD) > $(LINUX_DIR)/.config.target
# copy CONFIG_KERNEL_* settings over to .config.target
@ -114,6 +126,7 @@ define Kernel/Configure/Default
$(SCRIPT_DIR)/metadata.pl kconfig $(TMP_DIR)/.packageinfo $(TOPDIR)/.config $(KERNEL_PATCHVER) > $(LINUX_DIR)/.config.override
$(SCRIPT_DIR)/kconfig.pl 'm+' '+' $(LINUX_DIR)/.config.target /dev/null $(LINUX_DIR)/.config.override > $(LINUX_DIR)/.config.set
$(call Kernel/SetNoInitramfs)
$(call Kernel/SetNfsCmdline)
rm -rf $(KERNEL_BUILD_DIR)/modules
cmp -s $(LINUX_DIR)/.config.set $(LINUX_DIR)/.config.prev || { \
cp $(LINUX_DIR)/.config.set $(LINUX_DIR)/.config; \