# U-boot compilation for qemu-flash failed **URL:** \ **Category:** General Discussions\ **Created:** [May 28, 2020, 1:02pm UTC](https://hub.mender.io/t/u-boot-compilation-for-qemu-flash-failed/1980 "2020-05-28T13:02:02Z")\ **Posts on this page:** 14\ **Page:** 1
**Author:** ![sk-jame](https://yyz2.discourse-cdn.com/flex036/user_avatar/hub.mender.io/sk-jame/32/640_2.png) [@sk-jame](https://hub.mender.io/u/sk-jame)\ **Post date:** [May 28, 2020, 1:02pm UTC](https://hub.mender.io/t/u-boot-compilation-for-qemu-flash-failed/1980/1 "2020-05-28T13:02:02Z")
I’m trying to build qemu arm with emulating flash memory. I follow these instructions: > [@Vanilla qemuarm full multi partition emulation?](https://hub.mender.io/t/vanilla-qemuarm-full-multi-partition-emulation/1339): > > Basically I want to emulate a typical setup with boot + 2x rootfs + data on qemuarm, so I can properly test that my configs etc are populated correctly on /data running on standard runqemu script from yocto. I followed [QEMU, the FAST! processor emulator](https://hub.mender.io/t/qemu-the-fast-processor-emulator/420) but ran into problems, since I am running the build inside a VM in hyper-V, then the KVM part fails. When adding: MACHINE = “qemuarm” INHERIT += “mender-full-bios rm\_work” then it only creates ext4, and no uefiimg. When trying: [https://doc…](https://docs.mender.io/2.2/devices/yocto-project/raw-flash/example-qemu) [https://docs.mender.io/2.2/devices/yocto-project/raw-flash/example-qemu](https://docs.mender.io/2.2/devices/yocto-project/raw-flash/example-qemu) [https://hub.mender.io/t/qemu-the-fast-processor-emulator/420/2](https://hub.mender.io/t/qemu-the-fast-processor-emulator/420/2) [https://docs.mender.io/2.2/devices/yocto-project/raw-flash](https://docs.mender.io/2.2/devices/yocto-project/raw-flash) I added this options to local.conf: ``` MACHINE = "vexpress-qemu-flash" MENDER_MTDIDS = "nand0=40000000.flash" MENDER_IS_ON_MTDID = "40000000.flash" MENDER_MTDPARTS = "40000000.flash:512k(u-boot),-(ubi)" ``` During **bitbake core-image-minimal** got these errors: ``` | drivers/mtd/built-in.o: In function `concat_get_unmapped_area': | /home/devsrv/k/build_env/mender-qemu/build/tmp/work/vexpress_qemu_flash-poky-linux-gnueabi/u-boot/1_2018.01-r0/git/drivers/mtd/mtdconcat.c:674: undefined reference to `mtd_get_unmapped_area' | drivers/mtd/built-in.o: In function `concat_unlock': | /home/devsrv/k/build_env/mender-qemu/build/tmp/work/vexpress_qemu_flash-poky-linux-gnueabi/u-boot/1_2018.01-r0/git/drivers/mtd/mtdconcat.c:557: undefined reference to `mtd_unlock' | drivers/mtd/built-in.o: In function `concat_lock': | /home/devsrv/k/build_env/mender-qemu/build/tmp/work/vexpress_qemu_flash-poky-linux-gnueabi/u-boot/1_2018.01-r0/git/drivers/mtd/mtdconcat.c:523: undefined reference to `mtd_lock' | drivers/mtd/built-in.o: In function `concat_write': | /home/devsrv/k/build_env/mender-qemu/build/tmp/work/vexpress_qemu_flash-poky-linux-gnueabi/u-boot/1_2018.01-r0/git/drivers/mtd/mtdconcat.c:143: undefined reference to `mtd_write' | drivers/mtd/built-in.o: In function `concat_read': | /home/devsrv/k/build_env/mender-qemu/build/tmp/work/vexpress_qemu_flash-poky-linux-gnueabi/u-boot/1_2018.01-r0/git/drivers/mtd/mtdconcat.c:90: undefined reference to `mtd_read' | drivers/mtd/built-in.o: In function `concat_block_markbad': | /home/devsrv/k/build_env/mender-qemu/build/tmp/work/vexpress_qemu_flash-poky-linux-gnueabi/u-boot/1_2018.01-r0/git/drivers/mtd/mtdconcat.c:645: undefined reference to `mtd_block_markbad' | drivers/mtd/built-in.o: In function `concat_block_isbad': | /home/devsrv/k/build_env/mender-qemu/build/tmp/work/vexpress_qemu_flash-poky-linux-gnueabi/u-boot/1_2018.01-r0/git/drivers/mtd/mtdconcat.c:625: undefined reference to `mtd_block_isbad' | drivers/mtd/built-in.o: In function `concat_read_oob': | /home/devsrv/k/build_env/mender-qemu/build/tmp/work/vexpress_qemu_flash-poky-linux-gnueabi/u-boot/1_2018.01-r0/git/drivers/mtd/mtdconcat.c:257: undefined reference to `mtd_read_oob' | drivers/mtd/built-in.o: In function `concat_dev_erase': | /home/devsrv/k/build_env/mender-qemu/build/tmp/work/vexpress_qemu_flash-poky-linux-gnueabi/u-boot/1_2018.01-r0/git/drivers/mtd/mtdconcat.c:366: undefined reference to `mtd_erase' | drivers/mtd/built-in.o: In function `cfi_mtd_init': | /home/devsrv/k/build_env/mender-qemu/build/tmp/work/vexpress_qemu_flash-poky-linux-gnueabi/u-boot/1_2018.01-r0/git/drivers/mtd/cfi_mtd.c:239: undefined reference to `add_mtd_device' | /home/devsrv/k/build_env/mender-qemu/build/tmp/work/vexpress_qemu_flash-poky-linux-gnueabi/u-boot/1_2018.01-r0/git/drivers/mtd/cfi_mtd.c:258: undefined reference to `add_mtd_device' | /home/devsrv/k/build_env/mender-qemu/build/tmp/work/vexpress_qemu_flash-poky-linux-gnueabi/u-boot/1_2018.01-r0/git/Makefile:1261: recipe for target 'u-boot' failed. ``` ---
**Author:** ![drewmoseley](https://yyz2.discourse-cdn.com/flex036/user_avatar/hub.mender.io/drewmoseley/32/47_2.png) [@drewmoseley](https://hub.mender.io/u/drewmoseley)\ **Post date:** [May 28, 2020, 2:08pm UTC](https://hub.mender.io/t/u-boot-compilation-for-qemu-flash-failed/1980/2 "2020-05-28T14:08:49Z")
Hi @sk-jame, which branch of Yocto are you building? ---
**Author:** ![sk-jame](https://yyz2.discourse-cdn.com/flex036/user_avatar/hub.mender.io/sk-jame/32/640_2.png) [@sk-jame](https://hub.mender.io/u/sk-jame)\ **Post date:** [May 28, 2020, 2:32pm UTC](https://hub.mender.io/t/u-boot-compilation-for-qemu-flash-failed/1980/3 "2020-05-28T14:32:08Z")
I’m using yocto sumo ---
**Author:** ![drewmoseley](https://yyz2.discourse-cdn.com/flex036/user_avatar/hub.mender.io/drewmoseley/32/47_2.png) [@drewmoseley](https://hub.mender.io/u/drewmoseley)\ **Post date:** [May 28, 2020, 4:09pm UTC](https://hub.mender.io/t/u-boot-compilation-for-qemu-flash-failed/1980/4 "2020-05-28T16:09:35Z")
I was able to build u-boot in this configuration using the warrior branch. Do you have a need to stay on sumo? We don’t do much with that branch any more so if you stick with it and fix it, we would love to have a PR. ---
**Author:** ![sk-jame](https://yyz2.discourse-cdn.com/flex036/user_avatar/hub.mender.io/sk-jame/32/640_2.png) [@sk-jame](https://hub.mender.io/u/sk-jame)\ **Post date:** [May 28, 2020, 5:06pm UTC](https://hub.mender.io/t/u-boot-compilation-for-qemu-flash-failed/1980/5 "2020-05-28T17:06:37Z")
May be later, but now I need to have some test env. Is everything else is fine in my settings? I will try to build it with warrior. Also looks like script to run qemu - can’t work with flash. It have 1 switch related to nor memory, but this case can not be ever reached. ---
**Author:** ![drewmoseley](https://yyz2.discourse-cdn.com/flex036/user_avatar/hub.mender.io/drewmoseley/32/47_2.png) [@drewmoseley](https://hub.mender.io/u/drewmoseley)\ **Post date:** [May 28, 2020, 5:22pm UTC](https://hub.mender.io/t/u-boot-compilation-for-qemu-flash-failed/1980/6 "2020-05-28T17:22:11Z")
As far as I can tell yes, your settings should work with warrior just fine. Drew ---
**Author:** ![sk-jame](https://yyz2.discourse-cdn.com/flex036/user_avatar/hub.mender.io/sk-jame/32/640_2.png) [@sk-jame](https://hub.mender.io/u/sk-jame)\ **Post date:** [May 28, 2020, 6:40pm UTC](https://hub.mender.io/t/u-boot-compilation-for-qemu-flash-failed/1980/7 "2020-05-28T18:40:21Z")
@drewmoseley thx for you advices. it’s almost done with Warrior branch, but in the end I got error: ``` core-image-minimal-1.0-r0 do_image_mender: Size of rootfs is greater than the calculated partition space (68059136 > 58458112). This image won't fit on a device with the current storage configuration. Try reducing IMAGE_OVERHEAD_FACTOR if it is higher than 1.0, or raise MENDER_STORAGE_TOTAL_SIZE_MB if the device in fact has more storage. ``` in my config: MENDER\_STORAGE\_TOTAL\_SIZE\_MB = “256M” How can I fix it? upd: I set overhead factor to 0, but now I got error with ext4. I dunno why it make ext4 at all %\_% ``` ERROR: Task (/home/devsrv/k/build_env/mender-qemu/build/../sources/poky/meta/recipes-core/images/core-image-minimal.bb:do_image_ext4) failed with exit code '1' ``` ---
**Author:** ![drewmoseley](https://yyz2.discourse-cdn.com/flex036/user_avatar/hub.mender.io/drewmoseley/32/47_2.png) [@drewmoseley](https://hub.mender.io/u/drewmoseley)\ **Post date:** [May 28, 2020, 7:09pm UTC](https://hub.mender.io/t/u-boot-compilation-for-qemu-flash-failed/1980/8 "2020-05-28T19:09:02Z")
I’m not sure. I know tweaking the UBI parameters is kind of a black art so I don’t have much to offer. I also don’t know why it would be trying to build ext4. Does the bitbake IMAGE\_FSTYPES variable have ext4 in it? ---
**Author:** ![sk-jame](https://yyz2.discourse-cdn.com/flex036/user_avatar/hub.mender.io/sk-jame/32/640_2.png) [@sk-jame](https://hub.mender.io/u/sk-jame)\ **Post date:** [May 28, 2020, 7:47pm UTC](https://hub.mender.io/t/u-boot-compilation-for-qemu-flash-failed/1980/9 "2020-05-28T19:47:04Z")
@drewmoseley where I can check IMAGE\_FSTYPES content? ---
**Author:** ![drewmoseley](https://yyz2.discourse-cdn.com/flex036/user_avatar/hub.mender.io/drewmoseley/32/47_2.png) [@drewmoseley](https://hub.mender.io/u/drewmoseley)\ **Post date:** [May 28, 2020, 8:12pm UTC](https://hub.mender.io/t/u-boot-compilation-for-qemu-flash-failed/1980/10 "2020-05-28T20:12:33Z")
bitbake -e core-image-minimal 2\>&1 | grep ‘^IMAGE\_FSTYPES=’ If instead of grepping you redirect the entire output to a file, you can then search for IMAGE\_FSTYPES= and see the entire history of how that variable is generated. ie which recipes and classes set it. ---
**Author:** ![sk-jame](https://yyz2.discourse-cdn.com/flex036/user_avatar/hub.mender.io/sk-jame/32/640_2.png) [@sk-jame](https://hub.mender.io/u/sk-jame)\ **Post date:** [May 28, 2020, 8:14pm UTC](https://hub.mender.io/t/u-boot-compilation-for-qemu-flash-failed/1980/11 "2020-05-28T20:14:58Z")
``` IMAGE_FSTYPES="vexpress-nor mender mender.bmap ubimg mtdimg ubimg.bmap uefiimg uefiimg.bmap uefiimg.bz2 " ``` ---
**Author:** ![drewmoseley](https://yyz2.discourse-cdn.com/flex036/user_avatar/hub.mender.io/drewmoseley/32/47_2.png) [@drewmoseley](https://hub.mender.io/u/drewmoseley)\ **Post date:** [May 28, 2020, 8:36pm UTC](https://hub.mender.io/t/u-boot-compilation-for-qemu-flash-failed/1980/12 "2020-05-28T20:36:05Z")
Oh, try and edit conf/local.conf and change: > INHERIT += “mender-full-ubi” to: > INHERIT += “mender-full-ubi” ---
**Author:** ![sk-jame](https://yyz2.discourse-cdn.com/flex036/user_avatar/hub.mender.io/sk-jame/32/640_2.png) [@sk-jame](https://hub.mender.io/u/sk-jame)\ **Post date:** [May 28, 2020, 8:45pm UTC](https://hub.mender.io/t/u-boot-compilation-for-qemu-flash-failed/1980/13 "2020-05-28T20:45:13Z")
you wrote same string I think you mean mender-full to mender-full-ubi upd: it works! Build finished. But can’t run: ``` QEMU_AUDIO_DRV=none qemu-system-arm -m 256M -kernel /home/devsrv/k/build_env/mender-qemu/build/tmp/deploy/images/vexpress-qemu-flash/u-boot.elf -net nic,macaddr=52:54:00:f2:8b:df -net user,hostfwd=tcp::8822-:22 -display vnc=:23 -nographic -M vexpress-a9 -drive file=/tmp/mender-qemu.X5pTeKdr/nor0,if=pflash,format=raw -drive file=/tmp/mender-qemu.X5pTeKdr/nor1,if=pflash,format=raw ``` What it should be instead of 40000000.flash ? ``` Loading Environment from UBI... Could not find a valid device for 40000000.flash Partition ubi not found! ** Cannot find mtd partition "ubi" In: serial Out: serial Err: serial Net: smc911x-0 Hit any key to stop autoboot: 0 Saving Environment to UBI... Partition ubi not found! ** Cannot find mtd partition "ubi" Failed (1) Partition ubi not found! UBIFS error (pid: 1): cannot open "ubi0:rootfsa", error -19 Error reading superblock on volume 'ubi0:rootfsa' errno=-19! ubifsmount - mount UBIFS volume ``` So last tweaks in config resolve problem and it started! This should be add: ``` INHERIT += "mender-full-ubi" MACHINE = "vexpress-qemu-flash" MENDER_MTDIDS = "nor2=40000000.flash" MENDER_MTDPARTS = "40000000.flash:1m(u-boot)ro,1m(u-boot-env)ro,-(ubi)" ``` This should be removed: ``` INHERIT += "mender-full" ``` P.S. Thank you @drewmoseley ---
**Author:** ![drewmoseley](https://yyz2.discourse-cdn.com/flex036/user_avatar/hub.mender.io/drewmoseley/32/47_2.png) [@drewmoseley](https://hub.mender.io/u/drewmoseley)\ **Post date:** [May 28, 2020, 9:10pm UTC](https://hub.mender.io/t/u-boot-compilation-for-qemu-flash-failed/1980/14 "2020-05-28T21:10:28Z")
Excellent. Glad we could get you past this. Let us know what other progress you make. Drew