Paul Richards 9abd5d84ac This fixes a bug in the bcache code whereby false cache hits occur ... the first time block 0 is read. This fix initialises the block numbers to -1 which isn't the most correct thing for a daddr_t but it isn't likely to cause a problem in the boot blocks and it could do with a more thought out fix later. The bug is probably benign on the i386 but on the alpha it can cause initial file opens to fail. This is the cause of the "can't open /boot/boot.conf" errors. It appears on the alpha because of a number of combining factors. On the alpha the LABELSECTOR is 0 so block 0 needs to be read in from the media. The first time this happens you get a false hit because the bc_blkno field is zero initially. Also, the timestamp check against this cache hit succeeds because on the alpha a hacked getsecs() function can return 0 when it starts counting so that the zero initial timestamp + BCACHE_TIMEOUT is greater than the current time until getsecs() has counted passed BCACHE_TIMEOUT. The overall effect is that the first open() that occurs gets a false cache hit and returns garbage to the bd_strategy() function which then fails the open() call. This false hit then stays in the cache until BCACHE_TIMEOUT getsecs() ticks have passed; all open() calls during this time fail. This explains why you can generally access the media by the time you get to interp() and start issuing commands but the earlier attempts to run the boot scripts are failing. It's possible that this is causing the problem switching to the mfsroot floppy as well but I haven't confirmed that.		1998-11-19 18:12:03 +00:00
..
bcache.c	This fixes a bug in the bcache code whereby false cache hits occur	1998-11-19 18:12:03 +00:00
boot.c	Standardise on ';' as a component separator; it seems to be a little more	1998-11-02 16:55:57 +00:00
bootstrap.h	Implement a simple LRU block cache. By default this is initialised to 16k,	1998-11-02 23:28:11 +00:00
commands.c	- Add a new command 'lsdev' to list devices which might be likely to host	1998-10-31 02:53:12 +00:00
console.c	- Add a new command 'lsdev' to list devices which might be likely to host	1998-10-31 02:53:12 +00:00
dev_net.c
dev_net.h
devopen.c
gensetdefs.c
help.common	Add documentation for $rootdev.	1998-11-13 23:53:02 +00:00
interp_backslash.c
interp_forth.c	Eliminate much code cruft by extending simple file I/O API to include	1998-11-07 06:18:00 +00:00
interp_parse.c
interp.c	Add BootForth hooks; if BOOT_FORTH is defined, pass every line read	1998-11-04 00:29:01 +00:00
isapnp.c	Export an interface for presetting the ISA PnP read port address.	1998-10-22 20:20:51 +00:00
isapnp.h	Make ISA PnP work. This successfully enumerates as many ISA devices as I	1998-10-21 20:07:05 +00:00
load_aout.c	Only print filename and entry address for the kernel itself. The rest	1998-10-12 09:05:12 +00:00
load_elf.c	Load the first page of the file and use the headers in it. This should	1998-10-17 03:06:38 +00:00
load.c
ls.c	Fix a warning	1998-10-11 10:28:51 +00:00
Makefile.inc	Add BootForth hooks; if BOOT_FORTH is defined, pass every line read	1998-11-04 00:29:01 +00:00
misc.c
module.c
panic.c
pnp.c	Export an interface for presetting the ISA PnP read port address.	1998-10-22 20:20:51 +00:00
pnpdata	- Add a new command 'lsdev' to list devices which might be likely to host	1998-10-31 02:53:12 +00:00