[yocto] [meta-raspberrypi][PATCH V2] wic: support to set /root size and add extra partition

[Hongxu Jia]

- Support to add extra partition, such as add swap partition
  to workaround memory limitation

- Support to set /root size

Signed-off-by: Hongxu Jia <hongxu.jia at windriver.com>
---
 conf/machine/include/rpi-base.inc                     | 11 ++++++++++-
 ...age-raspberrypi.wks => sdimage-raspberrypi.wks.in} |  3 ++-
 2 files changed, 12 insertions(+), 2 deletions(-)
 rename wic/{sdimage-raspberrypi.wks => sdimage-raspberrypi.wks.in} (85%)

diff --git a/conf/machine/include/rpi-base.inc b/conf/machine/include/rpi-base.inc
index af1418d..9d0b688 100644
--- a/conf/machine/include/rpi-base.inc
+++ b/conf/machine/include/rpi-base.inc
@@ -6,7 +6,16 @@ SOC_FAMILY = "rpi"
 include conf/machine/include/soc-family.inc
 
 IMAGE_FSTYPES ?= "tar.bz2 ext3 rpi-sdimg"
-WKS_FILE ?= "sdimage-raspberrypi.wks"
+
+# Set size of /root partition, such as 4G
+# PI_WKS_ROOT_SIZE ?= "--size=4096M --overhead-factor 1"
+PI_WKS_ROOT_SIZE ?= ""
+
+# Add extra partition, such as 1G size /swap
+# PI_WKS_EXTRA_PARTTION = "part swap --ondisk mmcblk0 --size 44 --label swap --fstype=swap --size=1024M --overhead-factor 1"
+PI_WKS_EXTRA_PARTTION ?= ""
+
+WKS_FILE ?= "sdimage-raspberrypi.wks.in"
 
 XSERVER = " \
     xserver-xorg \
diff --git a/wic/sdimage-raspberrypi.wks b/wic/sdimage-raspberrypi.wks.in
similarity index 85%
rename from wic/sdimage-raspberrypi.wks
rename to wic/sdimage-raspberrypi.wks.in
index 01fbaea..743d757 100644
--- a/wic/sdimage-raspberrypi.wks
+++ b/wic/sdimage-raspberrypi.wks.in
@@ -3,4 +3,5 @@
 # Raspberry Pi. Boot files are located in the first vfat partition.
 
 part /boot --source bootimg-partition --ondisk mmcblk0 --fstype=vfat --label boot --active --align 4096 --size 20
-part / --source rootfs --ondisk mmcblk0 --fstype=ext4 --label root --align 4096
+part / --source rootfs --ondisk mmcblk0 --fstype=ext4 --label root --align 4096 ${PI_WKS_ROOT_SIZE}
+${PI_WKS_EXTRA_PARTTION}
-- 
2.17.1