Re: [Freedos-kernel] Fwd: FreeDOS kernel disk routines
Hi! 7-Ноя-2004 09:24 [EMAIL PROTECTED] (Bart Oldeman) wrote to [EMAIL PROTECTED]: BO> My 386 SX only had 80 MB hard disk space, which was far below the BO> first problematic barrier of 1024*16*63*512=512MB 1024*16*63*512=504Mb (or "528 Mb", as this counted by disk manufacturers). --- This SF.Net email is sponsored by: Sybase ASE Linux Express Edition - download now for FREE LinuxWorld Reader's Choice Award Winner for best database on Linux. http://ads.osdn.com/?ad_idU88&alloc_id065&op=click ___ Freedos-kernel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/freedos-kernel
Re: [Freedos-kernel] Fwd: FreeDOS kernel disk routines
On Sat, 6 Nov 2004, tom ehlert wrote: > However,FreeDOS hooks INT 13 No, if anything hooks INT 13 it could be LBACACHE but the kernel does not (it should but for different reasons -- see int2f/ah=13 in RBIL). > how are these disks/BIOS variants detected ? > > I have a faint memory of these translating BIOS's, but can't find it > in RBIL. RBIL D-1302 INT 13 - DISK - READ SECTOR(S) INTO MEMORY [...] AWARD AT BIOS and AMI 386sx BIOS have been extended to handle more than 1024 cylinders by placing bits 10 and 11 of the cylinder number into bits 6 and 7 of DH Probably a rare breed of machines. For most bit 6 & 7 of DH mean bit 6 and 7 of the (translated) head number. I have no idea how to distinguish this meaning. My 386 SX only had 80 MB hard disk space, which was far below the first problematic barrier of 1024*16*63*512=512MB > IMO the kernel shouldn't touch partitions that are to big to handle > (>1024 cylinders), unless LBA is detected. Agreed. That's what it does today. Bart --- This SF.Net email is sponsored by: Sybase ASE Linux Express Edition - download now for FREE LinuxWorld Reader's Choice Award Winner for best database on Linux. http://ads.osdn.com/?ad_id=5588&alloc_id=12065&op=click ___ Freedos-kernel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/freedos-kernel
Re: [Freedos-kernel] Fwd: FreeDOS kernel disk routines
Hi! 6-Ноя-2004 16:13 [EMAIL PROTECTED] (tom ehlert) wrote to [EMAIL PROTECTED]: te> From: Jose Antonio Senna te> ===8<==Original message text=== te> Excuse me for sending this directly to you, but I am still unable to post te> on Freedos lists. te> I do not know who (if anyone) mantains the FreeDOS kernel disk routines. te> If it is not you, please pass this mail to the appropriate person. te> The problem I found is: te> My computer BIOS INT 13 is able to access up to 4096 cylinders in a hard te> disk, te> by using bits 6 -7 of DH in INT 13 requests as bits 10-11 of cylinder te> number. If so, then this is non-standard and this completely prohibits LBA (with up to 256/255 heads). te> This BIOS variant is documented in Brown and Kyle interrupts list. Ralf Brown not documents such API deviation (or I miss something?). te> However,FreeDOS hooks INT 13 and,in doing so,rolls over any cylinder te> number modulo 1024, that is,if I make a request to access cylinder 1024,it te> does not report any error,but I get cylinder 0, and so on. FreeDOS _doesn't_ hooks INT 13. See main.c:setup_int_vectors() for list of hooked vectors. te> FreeDOS is not the only DOS to have this problem. May you quote code fragment, which works under other OSes (which?) and doesn't works under FD? te> Is it too difficult to solve ? te> ===8<===End of original message text=== te> my comment: te> how are these disks/BIOS variants detected ? te> I have a faint memory of these translating BIOS's, but can't find it te> in RBIL. te> IMO the kernel shouldn't touch partitions that are to big to handle (>>1024 cylinders), unless LBA is detected. --- This SF.Net email is sponsored by: Sybase ASE Linux Express Edition - download now for FREE LinuxWorld Reader's Choice Award Winner for best database on Linux. http://ads.osdn.com/?ad_idU88&alloc_id065&op=click ___ Freedos-kernel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/freedos-kernel
[Freedos-kernel] Fwd: FreeDOS kernel disk routines
This is a forwarded message From: Jose Antonio Senna Subject: FreeDOS kernel disk routines ===8<==Original message text=== Excuse me for sending this directly to you, but I am still unable to post on Freedos lists. I do not know who (if anyone) mantains the FreeDOS kernel disk routines. If it is not you, please pass this mail to the appropriate person. The problem I found is: My computer BIOS INT 13 is able to access up to 4096 cylinders in a hard disk, by using bits 6 -7 of DH in INT 13 requests as bits 10-11 of cylinder number. This BIOS variant is documented in Brown and Kyle interrupts list. However,FreeDOS hooks INT 13 and,in doing so,rolls over any cylinder number modulo 1024,that is,if I make a request to access cylinder 1024,it does not report any error,but I get cylinder 0, and so on. FreeDOS is not the only DOS to have this problem. Is it too difficult to solve ? I thank you for your attention JAS ===8<===End of original message text=== my comment: how are these disks/BIOS variants detected ? I have a faint memory of these translating BIOS's, but can't find it in RBIL. IMO the kernel shouldn't touch partitions that are to big to handle (>1024 cylinders), unless LBA is detected. tom --- This SF.Net email is sponsored by: Sybase ASE Linux Express Edition - download now for FREE LinuxWorld Reader's Choice Award Winner for best database on Linux. http://ads.osdn.com/?ad_id=5588&alloc_id=12065&op=click ___ Freedos-kernel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/freedos-kernel
