[yocto] [meta-raspberrypi][PATCH 3/5] sdcard_image-rpi.bbclass: Allocate more space for boot partition

[Javier Martinez Canillas]

From: Derek Foreman <derekf at osg.samsung.com>

The boot partition currently has a size of 20 MiB but just the start elf
binaries account almost 12 MiB, which means that only 8 MiB is left for
the kernel image. A recent kernel with many of its options built-in can
easily be more than 4 MiB so let's double the boot partition size to 40
MiB to make sure that it has enough room for the kernel image, the DTBs
and possible even a backup kernel.

Signed-off-by: Derek Foreman <derekf at osg.samsung.com>
[javier: Extended the commit message]
Signed-off-by: Javier Martinez Canillas <javier at osg.samsung.com>

---

 classes/sdcard_image-rpi.bbclass | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/classes/sdcard_image-rpi.bbclass b/classes/sdcard_image-rpi.bbclass
index 7592cc170451..4211fd438989 100644
--- a/classes/sdcard_image-rpi.bbclass
+++ b/classes/sdcard_image-rpi.bbclass
@@ -14,14 +14,14 @@ inherit linux-raspberrypi-base
 #                                                     Default Free space = 1.3x
 #                                                     Use IMAGE_OVERHEAD_FACTOR to add more space
 #                                                     <--------->
-#            4MiB              20MiB           SDIMG_ROOTFS
+#            4MiB              40MiB           SDIMG_ROOTFS
 # <-----------------------> <----------> <---------------------->
 #  ------------------------ ------------ ------------------------
 # | IMAGE_ROOTFS_ALIGNMENT | BOOT_SPACE | ROOTFS_SIZE            |
 #  ------------------------ ------------ ------------------------
 # ^                        ^            ^                        ^
 # |                        |            |                        |
-# 0                      4MiB     4MiB + 20MiB       4MiB + 20Mib + SDIMG_ROOTFS
+# 0                      4MiB     4MiB + 40MiB       4MiB + 40Mib + SDIMG_ROOTFS
 
 # This image depends on the rootfs image
 IMAGE_TYPEDEP_rpi-sdimg = "${SDIMG_ROOTFS_TYPE}"
@@ -40,7 +40,7 @@ SDIMG_KERNELIMAGE_raspberrypi2 ?= "kernel7.img"
 BOOTDD_VOLUME_ID ?= "${MACHINE}"
 
 # Boot partition size [in KiB] (will be rounded up to IMAGE_ROOTFS_ALIGNMENT)
-BOOT_SPACE ?= "20480"
+BOOT_SPACE ?= "40960"
 
 # Set alignment to 4MB [in KiB]
 IMAGE_ROOTFS_ALIGNMENT = "4096"
-- 
2.4.3