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+--- Thread: HOW TO - add modules to initramfs (/showthread.php?tid=6410)
HOW TO - add modules to initramfs - dukla2000 - 08-15-2018
Perhaps the harder part of this is to explain WHY you would want to do this. And HOW to identify the modules.
In my life this all started trying to put rootfs on my NVMe with 4.18.0-rc8 kernel. I could boot 4.18 from an SDcard and see the NVMe after boot. But the PCIe and NVMe initialisation were after rootfs was mounted during boot. And so any attempt to define the NVMe as rootfs caused a hang in the boot sequence as it was not available when required.
I was pretty unsuccesful trying to identify which modules were loaded during initramfs time and which were loaded after rootfs. lsmod showed the same results whether I had the PCIe card plugged in or not. So I got lucky and decided to try with the "likely candidates", pcie_rockchip_host and phy_rockchip_pcie.
The initramfs can be tweaked using the 3 text files in /etc/initramfs-tools/
I made no changes to initramfs.conf
I added the 2 modules to modules, now looks like
Code:
# List of modules that you want to include in your initramfs.
# They will be loaded at boot time in the order below.
#
# Syntax: module_name [args ...]
#
# You must run update-initramfs(8) to effect this change.
#
pcie_rockchip_host
phy_rockchip_pcieI changed update-initramfs.conf to give me a backup, so now looks like
Code:
#
# Configuration file for update-initramfs(8)
#
#
# update_initramfs [ yes | all | no ]
#
# Default is yes
# If set to all update-initramfs will update all initramfs
# If set to no disables any update to initramfs beside kernel upgrade
update_initramfs=yes
#
# backup_initramfs [ yes | no ]
#
# Default is no
# If set to no leaves no .bak backup files.
backup_initramfs=yesAt which stage a quick
Code:
sudo update-initramfs -u -k $(uname -r)gave me a new /boot/initrd.img-4.18.0-rc8-1060-ayufan-g45828c4db727 as well as a .bak. (Note - this all assumes you are running the target OS from an SDcard)
And then copy the altered bits of /boot to the NVMe, adjust the kernel command line to pickup the NVMe for root and everything was great.
RE: HOW TO - add modules to initramfs - Luke - 08-16-2018
Many thanks for this!
RE: HOW TO - add modules to initramfs - Bullet64 - 08-16-2018
@dukla2000: THANK YOU!! Works!!
RE: HOW TO - add modules to initramfs - jzhang18 - 08-16-2018
Thanks for the update
RE: HOW TO - add modules to initramfs - Bullet64 - 09-30-2018
With Kernel
Code:
Linux rockpro64v2_0 4.19.0-rc4-1065-ayufan-g72e04c7b3e06 #1 SMP PREEMPT Sat Sep 29 21:27:52 UTC 2018 aarch64 aarch64 aarch64 GNU/Linuxi don't need this
Code:
rock64@rockpro64v2_0:~$ df -h
Filesystem Size Used Avail Use% Mounted on
udev 1,9G 0 1,9G 0% /dev
tmpfs 388M 608K 387M 1% /run
/dev/nvme0n1 229G 8,1G 209G 4% /
tmpfs 1,9G 0 1,9G 0% /dev/shm
tmpfs 5,0M 0 5,0M 0% /run/lock
tmpfs 1,9G 0 1,9G 0% /sys/fs/cgroup
/dev/mmcblk0p6 112M 28K 112M 1% /boot/efi
/dev/sda1 916G 174G 696G 20% /mnt/backup
tmpfs 388M 0 388M 0% /run/user/1000iozone
Code:
rock64@rockpro64v2_0:~$ sudo iozone -e -I -a -s 100M -r 4k -r 16k -r 512k -r 1024k -r 16384k -i 0 -i 1 -i 2
Iozone: Performance Test of File I/O
Version $Revision: 3.429 $
Compiled for 64 bit mode.
Build: linux
Contributors:William Norcott, Don Capps, Isom Crawford, Kirby Collins
Al Slater, Scott Rhine, Mike Wisner, Ken Goss
Steve Landherr, Brad Smith, Mark Kelly, Dr. Alain CYR,
Randy Dunlap, Mark Montague, Dan Million, Gavin Brebner,
Jean-Marc Zucconi, Jeff Blomberg, Benny Halevy, Dave Boone,
Erik Habbinga, Kris Strecker, Walter Wong, Joshua Root,
Fabrice Bacchella, Zhenghua Xue, Qin Li, Darren Sawyer,
Vangel Bojaxhi, Ben England, Vikentsi Lapa.
Run began: Sun Sep 30 11:00:30 2018
Include fsync in write timing
O_DIRECT feature enabled
Auto Mode
File size set to 102400 kB
Record Size 4 kB
Record Size 16 kB
Record Size 512 kB
Record Size 1024 kB
Record Size 16384 kB
Command line used: iozone -e -I -a -s 100M -r 4k -r 16k -r 512k -r 1024k -r 16384k -i 0 -i 1 -i 2
Output is in kBytes/sec
Time Resolution = 0.000001 seconds.
Processor cache size set to 1024 kBytes.
Processor cache line size set to 32 bytes.
File stride size set to 17 * record size.
random random bkwd record stride
kB reclen write rewrite read reread read write read rewrite read fwrite frewrite fread freread
102400 4 94816 146795 159030 159656 54653 143233
102400 16 299647 411046 438669 442937 194936 404928
102400 512 1023181 1024309 960772 982149 800280 1032060
102400 1024 1116173 1168683 1112536 1140780 1004678 1178748
102400 16384 927019 1387086 1435659 1485404 1470077 1379217
iozone test complete.RE: HOW TO - add modules to initramfs - dukla2000 - 10-01-2018
(09-30-2018, 03:17 AM)Bullet64 Wrote: With KernelI think it is just persistent since you previously edited /etc/initramfs-tools/modules
Code:Linux rockpro64v2_0 4.19.0-rc4-1065-ayufan-g72e04c7b3e06 #1 SMP PREEMPT Sat Sep 29 21:27:52 UTC 2018 aarch64 aarch64 aarch64 GNU/Linux
i don't need this
On my system I have re-installed and have a standard (effectively null) modules. When I installed 4.19.0-rc4 my NVMe failed to initialise at all. Indeed even when I swapped rootfs back to the SDcard it did not initialise so I have not played any more with 4.19.