[OpenBIOS] HD boot fix

[Blue Swirl]

SILO a.out header gives a bit too short value. The following allows booting 
directly from HD succeed, maybe it helps other OSes.

I installed Debian 3.1r1 from CD image, with this patch I can boot from the 
HD.

diff -ru openbios-ref-19/arch/sparc32/aoutload.c 
openbios-patch-19/arch/sparc32/aoutload.c
--- openbios-ref-19/arch/sparc32/aoutload.c     2006-05-26 
11:50:28.000000000 +0000
+++ openbios-patch-19/arch/sparc32/aoutload.c   2006-06-03 
11:11:13.000000000 +0000
@@ -87,6 +87,9 @@
         size = addr_fixup(ehdr.a_text) + addr_fixup(ehdr.a_data);
     }

+    if (size < 7680)
+        size = 7680;
+
     start = 0x4000; // N_TXTADDR(ehdr);

     if (!check_mem_ranges(info, start, size))

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