diff --git a/kernel/trunk/Tupfile.lua b/kernel/trunk/Tupfile.lua
index 432f079b25..cfcc3610c8 100644
--- a/kernel/trunk/Tupfile.lua
+++ b/kernel/trunk/Tupfile.lua
@@ -1,5 +1,8 @@
 if tup.getconfig("NO_FASM") ~= "" then return end
 tup.rule("echo lang fix " .. ((tup.getconfig("LANG") == "") and "en" or tup.getconfig("LANG")) .. " > %o", {"lang.inc"})
-tup.rule({"kernel.asm", extra_inputs = {"lang.inc"}}, "fasm -m 131072 %f %o " .. tup.getconfig("KERPACK_CMD"), "kernel.mnt")
-tup.rule({"kernel.asm", extra_inputs = {"lang.inc"}}, "fasm -m 131072 %f %o -dextended_primary_loader=1" .. tup.getconfig("KERPACK_CMD"), "kernel.mnt.ext_loader")
-tup.rule({"kernel.asm", extra_inputs = {"lang.inc"}}, "fasm -m 131072 %f %o -dpretest_build=1 -ddebug_com_base=0xe9", "kernel.mnt.pretest")
+tup.rule({"kernel.asm", extra_inputs = {"lang.inc"}}, "fasm -m 262144 %f %o " .. tup.getconfig("KERPACK_CMD"), "kernel.mnt")
+--tup.rule({"kernel.asm", extra_inputs = {"lang.inc"}}, "fasm -m 262144 %f %o -s %o.fas" .. tup.getconfig("KERPACK_CMD"), {"kernel.mnt", extra_outputs = {"kernel.mnt.fas"}})
+--tup.rule({"kernel.mnt.fas", extra_inputs = {"kernel.mnt"}}, "symbols %f %o", "kernel.mnt.sym")
+--tup.rule({"kernel.mnt.fas", extra_inputs = {"kernel.mnt"}}, "listing %f %o", "kernel.mnt.lst")
+tup.rule({"kernel.asm", extra_inputs = {"lang.inc"}}, "fasm -m 262144 %f %o -dextended_primary_loader=1" .. tup.getconfig("KERPACK_CMD"), "kernel.mnt.ext_loader")
+tup.rule({"kernel.asm", extra_inputs = {"lang.inc"}}, "fasm -m 262144 %f %o -dpretest_build=1 -ddebug_com_base=0xe9", "kernel.mnt.pretest")
diff --git a/kernel/trunk/kernel.asm b/kernel/trunk/kernel.asm
index dd89e3e681..15d4bb046a 100644
--- a/kernel/trunk/kernel.asm
+++ b/kernel/trunk/kernel.asm
@@ -115,9 +115,9 @@ B32:
         cld
         rep stosd
 
-; Clear kernel undefined globals and slots
+; Clear kernel undefined globals and some more (what exactly?)
         mov     edi, endofcode - OS_BASE
-        mov     ecx, VGABasePtr - endofcode    ; why uglobals_size isn't enough?
+        mov     ecx, 0x90000    ; why uglobals_size isn't enough?
         sub     ecx, edi
         shr     ecx, 2
         rep stosd