Koala GNU (koala.gnu@tiscalinet.it) wrote: > Hi all, > > I am looking at the boot code in bootsect.S (2.4)and I have some doubt. > I tried to search the answers to my questions on marc.theaimsgroup.com > and on google bu I haven't found them. > > 1) In the bootsect code the first thing that is done is to copy the boot > sector to 0x90000 and move the program count to 0x9000, go. > Why it is necessary move the code there? is It not possible continue the > process from 0x7C00? As said in code : "High doesn't hurt. Low does." => This is done to preserve the firmware data areas in low memory. (I copy it from : http://www.moses.uklinux.net/patches/lki-1.html#ss1.4 ) > > 2) Another step is to move the parameters table from 0x78:0 to > 0x9000:0x4000-12. WHat are > the info contained in this table? The disk parameter table for the first > Can you send me a link to a site that > specify these info? http://www.moses.uklinux.net/patches/lki.html > Withouth these info I am not able to understand these three line of code > > movb $36, 0x4(%di) # patch sector count > movw %di, %fs:(%bx) > movw %es, %fs:2(%bx) > > I know that in 2.6 the boot from floppy using native code is not > supported anymore, but I am still interested on this stuff. > > Thanks in advance for your help Other correct me, if I am make mistakes. I am a newbie, and can and make mistakes ;-) -- Cordialement/Regards +-------------------------------------------------------+ | Christophe Lucas -- IOMEDA SA (clucas@iomeda.fr) | | Developpeur/Administrateur GNU/Linux | +-------------------------------------------------------+ | http://titux.tuxfamily.org -- Registered User #271267 | +-------------------------------------------------------+ -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
