On 5/4/20 11:14 AM, Rudolf J Streif wrote:
On 5/2/20 2:47 PM, Joshua Watt wrote:
On Sat, May 2, 2020, 1:22 PM Rudolf J Streif
<[email protected] <mailto:[email protected]>> wrote:
eMMC devices commonly have three hardware partitions: two boot
partitions and a user partition. I was looking for a convenient
way to
have wic build an image for the boot partition and one for the user
partition. However, that does not seem to be possible right out
of the
box. The variable WKS_FILE only accepts one file and not a list. The
class image_types_wic.bbclass uses WKS_FILES internally but that
seems
to be a search list and the code only builds the file it finds first.
I think part of the problem is that wks files are tied to a rootfs
image, so it's not currently possible to have multiple because there
is no way to differentiate them. Also because of that it's a little
odd to have a wks file that doesn't reference the rootfs it's built with.
You might be able to do it by making a simple dummy image recipe for
the boot partition(s), then overriding the WKS_FILE variable for the
image with a pn override in the machine.conf file (e.g.
WKS_FILE_pn-my-emmc-boot = "emmc-boot.wks" )
Thank you, Joshua. I might try your idea. I have noticed that it is
tied to the rootfs as I tried to use ondisk/ondrive to create images
for different partitions. But that did not work. Actually, the use of
the ondisk/ondrive parameter is not entirely obvious to me (but I also
have not dissected the code to figure it out).
I haven't used it a whole lot because of the way we provision our
devices, but I think its mostly so that wic can create a valid fstab in
the root file system that will mount all the partitions. This way, the
root file system image can remain generic and work with different
partitions layouts specified in the wks file.
It might be worthwhile looking into enhancing wic to be able to create
multiple images. Devices now also use universal flash storage (UFS)
which supports multiple logical disks like a SCSI drive once it is
provisioned.
Yes, that would be really nice. I don't think that wic currently has any
concept of "hardware partitions" (e.g. the emmc boot partitions or the
UFS SCSI LUNs), just GPT/MBR partitions. I'm not sure how you would add
support for it.
Is my understanding correct?
Any smart ideas to make this work?
Thanks,
Rudi
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Rudolf J Streif
CEO/CTO ibeeto
+1.855.442.3386 x700
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