Hi Raymond, > I'd recently gone through similar issue that you're experiencing. The > "Waiting for Removable Media" hang had been there for at least 7-8 years. A > workaround was put in around 2013. See here: > https://patchwork.openembedded.org/patch/42291/ > > Add "debugshell=30" (30 is in second, for timeout, or any other reasonable > value that you like) to the append > statement in your pxelinux.cfg/default file. Then you'd timeout when you > "normally" hangs, break into a shell, > where you could initiate udhcpc to configure networking, after which you > could transfer your bootable image onto > your RAM, and write out onto your HDD/SSD.
Unfortunately, we cannot use this trick because the MB which boots using PXE is not accessible and we want to use PXE booting for every boot... > It seems this kernel boot option of debugshell isn't documented officially in > kernel-parameters.txt file. > You could also look for init-live.sh on your yocto tree, and look for > "Waiting for Removable Media", and see the > surrounding code to get a fell how this debugshell thing works. I think this is what we will have to do .. I read the description of the internals of the initrd provided by Archlinux. The main difference is that Yocto initrd searches for the final rootfs on physical device (/dev/sdX) whereas the Archlinux initrd identifies (using LABEL) the support it was launched from and then searches on this support for the final rootfs. I guess this approach would unify all booting: from USB, CD-ROM and PXE.. But at the moment, I don't know how to reproduce the archlinux initrd works with Yocto... If only a guru of Yocto could help ... Vincent Date: Thu, 3 May 2018 14:27:46 +0000 From: Vincent Daanen <vincent.daa...@orthotaxy.com<mailto:vincent.daa...@orthotaxy.com>> To: "yocto@yoctoproject.org<mailto:yocto@yoctoproject.org>" <yocto@yoctoproject.org<mailto:yocto@yoctoproject.org>> Subject: [yocto] PXE booting ISO image fails with message "Waiting for removable media..." Message-ID: <vi1p192mb01430b16a66d217cb44829098d...@vi1p192mb0143.eurp192.prod.outlook.com<mailto:vi1p192mb01430b16a66d217cb44829098d...@vi1p192mb0143.eurp192.prod.outlook.com>> Content-Type: text/plain; charset="utf-8" Hi, We want to deploy image created with Yocto (Rocko) via PXE. The target board is a Intel-based SBC (AAEON GENE BT05). At first, we tried with a ISO from Archlinux and the target-board successfully booted. Then we create a ISO using Yocto but boot hangs with a message ?Waiting for removable media ...?. Googling this message points me to this post: http://thread.gmane.org/gmane.linux.embedded.yocto.general/20611 which relates exactly the same problem, explain why the issue raises, gives an indication to how to fix .. and that?s all ? So at this point, we know that the problem comes from the /recipes-core/initrdscripts/files/init-live.sh file. It seems searching for an /dev/sdx should be protected by a timeout set by default to 30 secs but during our trials, no timeout seems to exist. What we do not understand, is how to highlight the differences between the Yocto-based and the Archlinux ISO files so that we can ?unblock? the boot using the Yocto-based ISO file. Is the someone here how could help? Thanks Vincent
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