How to boot from SCSI Hard drive
This issue is more related to SCSI raid on servers, and an indication that it is happening is the following message at boot time, just after grub is launched.
Volume group "VolGroup00" not found
The way to fix this issue is adding to the kernel the
How to enable extra serial ports
There are some systems that might use the ttyS4 and/or ttyS5 known in other worlds as COM5 and COM6 respectively. By default these ports are detected under Linux.
To enable the extra serial ports go into the BIOS, find the serial ports and write down the following data:
With this info, add the following line for COM5 and above to /etc/rc.d/rc.local, make sure to place them before the elo driver command lines.
setserial /dev/ttySn irq N port 0xDDDD uart 16550A baud_base 115200
- n is the number of the COM minus 1 (ttyS4 = COM5)
- N is the IRQ
- DDDD is the port number in hexadecimal format with 4 digits (2d8 = 02d8)
Then, tell the kernel that will have 6 ports on system running. To have done this edit the /etc/grub.conf file and add at the end of the kernel line the variable
8250.nr_uarts=6. The entry looks like:
root (hd0,0) kernel /vmlinuz-2.6.18-92.el5 ro root=LABEL=/ rhgb vga=792 quiet 8250.nr_uarts=6 initrd /initrd-2.6.18-92.el5.img
How to enable graphic cart at boot time on AMD Geode
On AMD Geode LX based terminals, the graphic card doesn't works with the standard frame buffer driver, that means the parameters
xdriver=vesa vga=792 won't work, or maybe yes but soonest will turn blank the screen and stop to work.
To solve this issue on AMD Geode terminals add to the kernel the
1024x768 could be changed to match the size of current monitor.
How to setup screen size on Grub bootloader
In order to display small fonts on terminal is necessary to set the vga value as kernel parameter to enable the frame buffer vga mode, the following table shows the possible values:
Color depth | 640x480 800x600 1024x768 1280x1024 -----------------+------------------------------------- 256 (8bit)| 769 771 773 775 32000 (15bit)| 784 787 790 793 65000 (16bit)| 785 788 791 794 16.7 Mill.(24bit)| 786 789 792 795