How do I modify the parameter list passed to the kernel command line when booting from an SD card?
I thought simply updating /boot/grub/grub.cfg with the modifications would work, but the output of /proc/cmdline does not change before and after the grub.cfg update.
So that makes me think that /boot/grub/grub.cfg isn’t being used during bootup. Is there another place where the kernel command line parameters are specified? Perhaps in an already-compiled image?
Below is some possibly relevant output from the bootup process. Note in particular the EFI stub error, and the lack of EFI parameters from FDT.
UEFI firmware (version PreAlpha built at 10:50:05 on Nov 28 2015) EFI stub: Booting Linux Kernel... Failed to open file: initrd.img EFI stub: ERROR: Failed initrd from command line! [ 0.000000] Initializing cgroup subsys cpuset [ 0.000000] Initializing cgroup subsys cpu [ 0.000000] Initializing cgroup subsys cpuacct [ 0.000000] Linux version 3.18.0-linaro-hikey (m@cris-t540p) (gcc version 5.3.1 20160113 (Linaro GCC 5.3-2016.02) ) #1 SMP PREEMPT Tue Jul 5 13:48:24 EDT 2016 [ 0.000000] CPU: AArch64 Processor [410fd033] revision 3 [ 0.000000] Detected VIPT I-cache on CPU0 [ 0.000000] Early serial console at I/O port 0x0 (options '') [ 0.000000] bootconsole [uart0] enabled [ 0.000000] efi: Getting EFI parameters from FDT: [ 0.000000] EFI v2.40 by Linaro HiKey EFI Nov 28 2015 10:50:07 [ 0.000000] efi: [ 0.000000] cma: Reserved 128 MiB at 0x0000000071800000 [ 0.000000] psci: probing for conduit method from DT. [ 0.000000] psci: PSCIv1.0 detected in firmware. [ 0.000000] psci: Using standard PSCI v0.2 function IDs [ 0.000000] PERCPU: Embedded 14 pages/cpu @ffffffc07f70f000 s18496 r8192 d30656 u57344 [ 0.000000] Built 1 zonelists in Zone order, mobility grouping on. Total pages: 508430 [ 0.000000] Kernel command line: dtb=hi6220-hikey.dtb console=ttyAMA3,115200 earlycon=pl011,0xf7113000 root=/dev/mmcblk1p2 rw rootwait initrd=initrd.img efi=noruntime
For reference, here is the contents of my /boot:
linaro@linaro-alip:~$ ls /boot
Image System.map-3.18.0-linaro-hikey efi hi6220-hikey.dtb initrd.img-3.18.0-linaro-hikey
Image-3.18.0-linaro-hikey config-3.18.0-linaro-hikey grub initrd.img
I can see /boot/initrd.img is there, so I’m not sure why the EFI stub fails to open it. Perhaps it is looking in a different location?
Any help is appreciated.