> > Is there a VGA display code that will do 800x600x16bit?
Stage 0 = in the BIOS
Execute a JMP at 0xFFFFFFF0 ( 1st instruction after power on )
Power-On-Self-Test
Detect hardware
Load Interrupt Vector table ( 0x0 )
Find Master Boot Sector ( 1st 512Bytes and sector ends with 0xaa55 )
Copy Master Boot Sector ( track 0 Sector 0 ) into RAM at 0x7C00
Execute ( int 0x19 ) the MBR ( aka 1st Stage Loader ) moved to 0x9000
Stage 1 BootLoader ( aka Master Boot Sector )
the BootLoader is arch/i386/boot/bootsect.S Displays: Loading….. o setup() is loaded at 0x00090200 o zImage is loaded at 0x00010000 bootsect.S -Ttext 0x1000 o bzImage is loaded at 0x00100000 bbootsect.S -Ttext 0x100000 -D'BIG_KERNEL'
Print L than load 2nd stage
Print I than execute the 2nd stage
Stage 1.5 FS
Grub will load its filesystem boot info
Stage 2 Main Boot Process
Print L than load 2nd stage
Read the /boot/map file
Print O after the map file was loaded
Grub and Lilo will show its kernel options to boot Displays: Uncompressing vmlinuz…..
Stage 3 Kernel - Hardware Detect and Scan
Jump/Execute setup() ( arch/i386/boot/setup.S or bsetup.S ) o Scan the PCI bus for peripherals: KB, mouse, svga, disks o setup interrupts vectors o Load the device Drivers ( modules ) o switch from real-mode to protected mode
— or — is this where: "uncompressing linux" displays
Jump/Execute startup_32() ( arch/i386/kernel/head.S ) ( Start PID=0 )
Stage 4 Root FileSystem
Jump/Execute start_kernel() ( start PID=1 )
Load the optional ramdisk ( execute /linuxrc ) or is it before pid=0
run init ( /etc/inittab ) ( PID = 1 )
run rc.sysinit
run rcx.d init scripts
BgLug.ca Linux Boot Process ( LinuxBootProcess.pdf ) ( local copy ) KevinBoone.com Understanding the Linux Boot Process ExecPC.com Writing Your Own BootLoader ExecPC.com i386 Boot Protocol NonDot.org Boot Process LinuxDevCenter.com
How Your Computer Boots, start_kernel() , Loading…, Uncompressing…
TLDP.org Kernel Image - lots of details - start_kernel() Moses.ukLinux.net Kernel Image
wustl.edu Similar to Hacking Grub fifi.org Hacking Grub ( same as LinuxSelfHelp ) LinuxSelfHelp.com Hacking Grub ( same as FiFi.org ) uruk.org Grub Technical Info ( Boot Limits/Issues )
Temple.edu
rhce2b.com annoying popups
documented on: 2005.01.14
Knoppix defaults to 1024x768 and I only have 800x600. This was OK until the root partition glitched in a file-system check and I could not read the bottom of the screen to find out what was happpening, or enter any commands (except by guesswork). I fixed this by changing the VGA code in 'lilo.conf' from 791 to either NORMAL or 0x0103 (800x600x256). Both produced the same display, 80x25 on the central 50% or so of the screen, but without the penguin at the top left.
However, what I would like to do, if possible, is have the neat display that goes with VGA=791, but in an 800x600 space. Is there a VGA display code that will do this?
> > Is there a VGA display code that will do 800x600x16bit?
> Yes, there is you want 788.
Yay! Works! Thank you very much!
Here are two charts of vga values you can try to see if it gives you some kind of graphics on boot.
| Colors ( depth) | 640x480 | 800x600 | 1024x768 | 1280x1024 | 1600x1200 |
|---|---|---|---|---|---|
| 256 ( 8 bit) | 769 | 771 | 773 | 775 | 796 |
| 32,768 (15 bit) | 784 | 787 | 790 | 793 | 797 |
| 65,536 (16 bit) | 785 | 788 | 791 | 794 | 798 |
| 16.8M (24 bit) | 786 | 789 | 792 | 795 | 799 |
| 640x480 | 800x600 | 1024x768 | 1280x1024 | |
|---|---|---|---|---|
| 256 | 0x301 | 0x303 | 0x305 | 0x307 |
| 32k | 0x310 | 0x313 | 0x316 | 0x319 |
| 64k | 0x311 | 0x314 | 0x317 | 0x31A |
| 16M | 0x312 | 0x315 | 0x318 | 0x31B |
documented on: 01-14-07, bigrigdriver