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Darren Hart 02f6806cf2 bootimg: Use FAT 32 for images larger than 512MB
Fixes [YOCTO #2138]

Commit 2175842116 dropped the forced use
of FAT32 for the hddimg generation as it broke with very small images
(< 32MB). Unfortunately, left to its own devices, mkdosfs appears to select
FAT16 even for very large images, resulting in 2.2GB images being
generated as FAT16:

$ ls -lah core-image-lsb-sdk-atom-pc-20121010233936.hddimg
-rw-rw-r-- 1 dvhart dvhart 2.2G 2012-10-17 08:00 core-image-lsb-sdk-atom-pc-20121010233936.hddimg

$ file !$
file core-image-lsb-sdk-atom-pc-20121010233936.hddimg
core-image-lsb-sdk-atom-pc-20121010233936.hddimg: x86 boot sector, code offset 0x58, OEM-ID "SYSLINUX", sectors/cluster 128, root entries 512, Media descriptor 0xf8, sectors/FAT 138, heads 64, sectors 4502496 (volumes > 32 MB) , serial number 0x50761926, label: "boot       ", FAT (16 bit)

The result was a runtime boot error from SYSLINUX and a failure to boot
live images greater than 1GB in size.

While strictly speaking it is the cluster count that determines which
FAT size is used, that calculation requires more information than we
have readily available (such as sectors per cluster). If we let mkdosfs
determine sectors per cluster and just set a sane threshold above which
FAT32 is used, we get correct bootable images. With this patch the 2.2GB
core-image-lsb-sdk uses FAT32 and the 21 MB core-image-minimal uses
FAT16, and both boot in qemu successfully:

$ ls -lah tmp/deploy/images/core-image-lsb-sdk-atom-pc-20121212220835.hddimg
-rw-r--r-- 1 dvhart dvhart 2.2G 2012-12-12 14:18 tmp/deploy/images/core-image-lsb-sdk-atom-pc-20121212220835.hddimg

$ file !$
file tmp/deploy/images/core-image-lsb-sdk-atom-pc-20121212220835.hddimg
tmp/deploy/images/core-image-lsb-sdk-atom-pc-20121212220835.hddimg: x86 boot sector, code offset 0x58, OEM-ID "SYSLINUX", sectors/cluster 8, Media descriptor 0xf8, heads 64, sectors 4470304 (volumes > 32 MB) , FAT (32 bit), sectors/FAT 4357, reserved3 0x800000, serial number 0x50c902b7, label: "boot       "

$ ls -lah tmp/deploy/images/core-image-minimal-atom-pc-20121212220600.hddimg
-rw-r--r-- 1 dvhart dvhart 21M 2012-12-12 14:06 tmp/deploy/images/core-image-minimal-atom-pc-20121212220600.hddimg

$ file !$
file tmp/deploy/images/core-image-minimal-atom-pc-20121212220600.hddimg
tmp/deploy/images/core-image-minimal-atom-pc-20121212220600.hddimg: x86 boot sector, code offset 0x58, OEM-ID "SYSLINUX", sectors/cluster 4, root entries 512, sectors 41408 (volumes <=32 MB) , Media descriptor 0xf8, sectors/FAT 41, heads 64, serial number 0x50c8ffec, label: "boot       ", FAT (16 bit)

I have tested and booted core-image-minimal and core-image-lsb-sdk for
atom-pc with qemu-system-i386 using this patch.

(From OE-Core rev: 28d625022d524eb8832f17e221679f68202401a2)

Signed-off-by: Darren Hart <dvhart@linux.intel.com>
Cc: Steve Sakoman <steve@sakoman.com>
Cc: Joshua Immanuel <josh@hipro.co.in>
Cc: Przemek Czesnowicz <przemyslawx.czesnowicz@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
2013-01-07 11:32:13 +00:00
bitbake bitbake: Revert "BBHandler: Ensure parser state engine is correctly reset for new parsing" 2012-12-07 18:09:03 +00:00
documentation documentation: poky-ref-manual - Fixed grammar typo. 2012-12-07 17:13:17 +00:00
meta bootimg: Use FAT 32 for images larger than 512MB 2013-01-07 11:32:13 +00:00
meta-hob meta-hob: Add a new meta-hob layer 2012-02-24 00:39:10 +00:00
meta-skeleton linux-yocto-custom: Clarify defconfig usage 2012-10-03 10:03:08 +01:00
meta-yocto local.conf.sample: add PATH to SSTATE_MIRRORS comments 2012-10-15 14:43:48 +01:00
meta-yocto-bsp linux-yocto-bsps/3.4: perf: parallel build and tools fixes 2012-10-10 15:24:13 +01:00
scripts sstate-cache-management: hide error message when one of possible layer location doesn't exist 2012-10-10 15:24:13 +01:00
.gitignore gitignore: Fix for poky repository 2012-10-15 14:42:59 +01:00
LICENSE LICENSE: Clarify the license recipe source code is under 2010-06-10 10:13:18 +01:00
oe-init-build-env Various typoes fixed, all comments or output strings. 2012-03-26 12:13:05 +01:00
README README: Clarify where to send patches 2012-08-22 14:05:00 +01:00
README.hardware README.hardware: extend USB-ZIP instructions 2012-04-01 12:52:03 +01:00

Poky
====

Poky is an integration of various components to form a complete prepackaged
build system and development environment. It features support for building
customised embedded device style images. There are reference demo images
featuring a X11/Matchbox/GTK themed UI called Sato. The system supports
cross-architecture application development using QEMU emulation and a
standalone toolchain and SDK with IDE integration.

Additional information on the specifics of hardware that Poky supports
is available in README.hardware. Further hardware support can easily be added
in the form of layers which extend the systems capabilities in a modular way.

As an integration layer Poky consists of several upstream projects such as 
BitBake, OpenEmbedded-Core, Yocto documentation and various sources of information 
e.g. for the hardware support. Poky is in turn a component of the Yocto Project.

The Yocto Project has extensive documentation about the system including a 
reference manual which can be found at:
    http://yoctoproject.org/documentation

OpenEmbedded-Core is a layer containing the core metadata for current versions
of OpenEmbedded. It is distro-less (can build a functional image with
DISTRO = "") and contains only emulated machine support.

For information about OpenEmbedded, see the OpenEmbedded website:
    http://www.openembedded.org/

Where to Send Patches
=====================

As Poky is an integration repository, patches against the various components
should be sent to their respective upstreams.

bitbake:
    bitbake-devel@lists.openembedded.org

meta-yocto:
    poky@yoctoproject.org

Most everything else should be sent to the OpenEmbedded Core mailing list.  If
in doubt, check the oe-core git repository for the content you intend to modify.
Before sending, be sure the patches apply cleanly to the current oe-core git
repository.
    openembedded-core@lists.openembedded.org

Note: The scripts directory should be treated with extra care as it is a mix
      of oe-core and poky-specific files.