6.2-PRERELEASE/amd64 boot kernel.gz failes
Ruslan Ermilov
ru at freebsd.org
Thu Sep 28 03:30:27 PDT 2006
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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