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| 19:57.01 | VeiledSpectre | heya everyone - i have a question - how closely tied to the kernel configuration is the init system? |
| 19:58.15 | VeiledSpectre | I have a precompiled kernel from out of tree that im trying to put a rootfilesystem on top of, but so far the only time im successful is if I allow systemd to be the init system - thing is i dont really want to use systemd because of the space it consumes on the systems persistant memory |
| 19:59.01 | kergoth | not very closely tied at all. systemd requires certain options be enabled, but that's about it |
| 19:59.13 | *** mode/#elinux [-o kergoth] by kergoth |
| 19:59.44 | VeiledSpectre | strange... |
| 19:59.52 | kergoth | what's the behavior? |
| 20:01.19 | VeiledSpectre | I have a precompiled kernel, preloader, bootloader (uboot), and device tree file... The stock root filesystem uses systemd as the init, but its about 160 MB... our target device has 256 MB of ROM... I have been tasked with building a new rootfs to replace the stock one |
| 20:02.19 | VeiledSpectre | So far I have been attempting to use buildroot. When i choose systemd as my init system, the system boots, but if i choose busybox, it doesnt seem to boot. The watchdog will bite the system and ill restart loading uboot again |
| 20:02.23 | kergoth | that's not what i mean. you imply that sysvinit isn't working, so what happens when you try to boot it? |
| 20:03.03 | kergoth | the real question is, what kernel commandline is being used, and is it coming from u-boot or copmiled in |
| 20:03.09 | kergoth | check /proc/cmdline in the working rootfs |
| 20:03.21 | kergoth | if e.g. init=/path/to/systemd, clearly that'd be a problem |
| 20:03.44 | kergoth | that's the only thing that immediately comes to mind, otehr than cranking up kernel console debugging so you can see more of what's going on when the boot fails |
| 20:06.58 | VeiledSpectre | can you explain what you mean by "init=<pathtosystemd>" and what this commandline is? And according to the working image, "cat /proc/cmdline" yields, "console=ttys0,115200 root=/dev/mmcblk0p2 rw rootwait" |
| 20:07.18 | kergoth | okay, don't see anything that would be problematic there. |
| 20:08.26 | VeiledSpectre | my impression is that system initialization is generally a linear handoff path, like "preloader->bootloader->kernel->initsystem->userland |
| 20:08.57 | kergoth | the kernel commandline can specify a non-default init to run, which was what i wanted to check |
| 20:09.05 | kergoth | e.g. if it explicitly ran systemd, then giving it a rootfs without it would break |
| 20:09.24 | VeiledSpectre | and why i attempt to boot the "nonfunctioning" system, I do see parts of the kernel init so I think busybox is missing something... |
| 20:09.28 | VeiledSpectre | *when |
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| 22:17.59 | pa287700 | Anyone here who might be able to help a relative newbie with cross compiling for an ARM Linux target? |
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