Passing parameters to the kernel at boot time is usually done by typing:
systemModuleName.parameter=value . In our case this would be:
usbcore.usbfs_memory_mb=256
How this can be done depends on the system bootloader. For systems using the GRUB2 bootloader
the "/etc/default/grub" ( or in some distributions "/etc/default/grub/c.cfg" ) file has
to be modified.
Warning:
Always modify configuration files with extreme caution, since the slightest syntax error may
render the file invalid, or even the computer not bootable!
After opening this file, the GRUB_CMDLINE_LINUX_DEFAULT entry must be located. It usually has
the following value:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
In order to invoke the Kernel with the usbfs_memory_mb parameter, it should be modified like:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash usbcore.usbfs_memory_mb=256"
As a final step, GRUB has to be updated by executing the update-grub script:
sudo update-grub
If all went well, after rebooting the system, the kernel will utilize the requested amount of memory for
the usbcore subsystem.
Note:
On systems with GRUB Legacy support the bootloader settings are controlled by other files (
e.g. "/boot/grub/menu/c.lst" etc.). In this case it is recommended to upgrade your
bootloader to GRUB2 :
sudo apt-get install grub2
If, for some reason, this is not an option, then the menu.lst itself could be directly modified
as an absolutely last resort. Always keep in mind that it is strongly recommended not to
tamper directly with files in the /boot/grub directory! The smallest typing error can
render the system not bootable!
7.3.5.1 For Odroid-XU3 Users
To adapt the usbfs buffer size using Odroid-XU3, please follow these steps:
Open the file /media/boot/boot.ini as root.1.
Add or adapt the string "usbcore.usbfs_memory_mb=256" at the end of the boot arguments
using a blank:
setenv bootargs "... usbcore.usbfs_memory_mb=256"
2.
Save the file.3.
Reboot the Odroid-XU3 board.4.
7 Quickstart
43
To Next Page
Loading...
Need help?
General