6.2-PRERELEASE/amd64 boot kernel.gz failes

[Ruslan Ermilov]

On Thu, Sep 28, 2006 at 02:33:10AM +0400, Ruslan Ermilov wrote:
> I can confirm this: RELENG_6 doesn't pxeboot when /boot/kernel/kernel
> is gzipped.  In my case, it hangs just after loading a loader.conf file.
> I've also verified that loading gzipped kernels/modules works on
> 7-CURRENT/i386.  So it's either loader vs. pxeboot issue (unlikely,
> since pxeboot reuses the loader binary), or i386 vs. amd64 issue
> (unlikely as well as amd64 reuses the i386 boot code), or more likely
> because some changes were not MFCed.  Perhaps this one:
> 
> : sobomax     2005-12-19 09:00:11 UTC
> : 
> :   FreeBSD src repository
> : 
> :   Modified files:
> :     sys/boot/i386/libi386 Makefile biosdisk.c biospnp.c biossmap.c 
> :                           i386_copy.c 
> :   Log:
> :   Long-long time ago, when the trees were large and memory expensive amount of
> :   memory directly available to loader(8) and friends was limited to 640K on i386.
> :   Those times have passed long time ago and now loader(8) can directly access
> :   up to 4GB of RAM at least theoretically. At the same time, there are several
> :   places where it's assumed that malloc() will only allocate memory within
> :   first megabyte.
> :   
> :   Remove that assumption by allocating appropriate bounce buffers for BIOS
> :   calls on stack where necessary.
> :   
> :   This allows using memory above first megabyte for heap if necessary.
> :   
> :   Revision  Changes    Path
> :   1.39      +3 -0      src/sys/boot/i386/libi386/Makefile
> :   1.46      +10 -17    src/sys/boot/i386/libi386/biosdisk.c
> :   1.10      +1 -1      src/sys/boot/i386/libi386/biospnp.c
> :   1.4       +3 -2      src/sys/boot/i386/libi386/biossmap.c
> :   1.11      +6 -22     src/sys/boot/i386/libi386/i386_copy.c
> 
> I'll narrow this down tomorrow if noone bites me while I sleep.  :-)
> 
Yes, this and the follow-up commit plus the following diff make
pxeboot work with gzipped files.

%%%
Index: i386/loader/main.c
===================================================================
RCS file: /home/ncvs/src/sys/boot/i386/loader/main.c,v
retrieving revision 1.37
diff -u -r1.37 main.c
--- i386/loader/main.c	4 Aug 2006 07:56:32 -0000	1.37
+++ i386/loader/main.c	28 Sep 2006 09:06:02 -0000
@@ -91,7 +91,7 @@
      */
     bios_getmem();
 
-#ifdef LOADER_BZIP2_SUPPORT
+#if 1
     heap_top = PTOV(memtop_copyin);
     memtop_copyin -= 0x300000;
     heap_bottom = PTOV(memtop_copyin);
%%%

Here's the loader "heap" command output on the same machine:

: 6.x /boot/loader (unpatched):
: 	OK heap
: 	Active Allocations: 803/2173
: 	274432 bytes reserved 194432 bytes allocated
: 	65 fragments (30016 bytes fragmented)
: 	heap base at 0x404c0, top at 0x834c0
: 
: 7.x pxeboot loader (unpatched):
: 	OK heap
: 	Active Allocations: 896/2209
: 	229376 bytes reserved 196728 bytes allocated
: 	71 fragments (18992 bytes fragmented)
: 	heap base at 0x404c0, top at 0x784c0, upper limit at 0x9fc00
: 
: 7.x pxeboot loader (patched):
: 	OK heap
: 	Active Allocations: 896/2209
: 	229376 bytes reserved 196728 bytes allocated
: 	71 fragments (18992 bytes fragmented)
: 	heap base at 0xfbce6000, top at 0xfbd1e000, upper limit at 0xfbfe6000


Cheers,
-- 
Ruslan Ermilov
ru at FreeBSD.org
FreeBSD committer
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