[SeaBIOS] [PATCH] build: explicitly set rom size

[Gerd Hoffmann]

Replace the automatic rom sizing with an explicit kconfig option.
ROM changing size is a problem for qemu live migration, therefore
an explicit size is prefered.

Make the default rom size 256k, with the recent xhci support merge
seabios doesn't fit into 128k any more.

Signed-off-by: Gerd Hoffmann <kraxel at redhat.com>
---
 Makefile            |  3 ++-
 scripts/checkrom.py | 15 +++++++++------
 src/Kconfig         |  8 ++++++++
 3 files changed, 19 insertions(+), 7 deletions(-)

diff --git a/Makefile b/Makefile
index e801720..c8bed85 100644
--- a/Makefile
+++ b/Makefile
@@ -178,7 +178,8 @@ $(OUT)bios.bin.elf $(OUT)bios.bin: $(OUT)rom.o scripts/checkrom.py
 	@echo "  Prepping $@"
 	$(Q)$(OBJDUMP) -thr $< > $<.objdump
 	$(Q)$(OBJCOPY) -O binary $< $(OUT)bios.bin.raw
-	$(Q)$(PYTHON) ./scripts/checkrom.py $<.objdump $(OUT)bios.bin.raw $(OUT)bios.bin
+	$(Q)$(PYTHON) ./scripts/checkrom.py $<.objdump $(CONFIG_ROM_SIZE) \
+		$(OUT)bios.bin.raw $(OUT)bios.bin
 	$(Q)$(STRIP) -R .comment $< -o $(OUT)bios.bin.elf
 
 
diff --git a/scripts/checkrom.py b/scripts/checkrom.py
index 6f07ac8..0ef7299 100755
--- a/scripts/checkrom.py
+++ b/scripts/checkrom.py
@@ -21,7 +21,7 @@ def checksum(data, start, size, csum):
 
 def main():
     # Get args
-    objinfo, rawfile, outfile = sys.argv[1:]
+    objinfo, finalsize, rawfile, outfile = sys.argv[1:]
 
     # Read in symbols
     objinfofile = open(objinfo, 'rb')
@@ -32,11 +32,14 @@ def main():
     rawdata = f.read()
     f.close()
     datasize = len(rawdata)
-    finalsize = 64*1024
-    if datasize > 64*1024:
-        finalsize = 128*1024
-        if datasize > 128*1024:
-            finalsize = 256*1024
+    finalsize = int(finalsize) * 1024
+    if datasize > finalsize:
+        print "Error!  ROM doesn't fit (%d > %d)" % (datasize, finalsize)
+        print "   You have to either increate the size (CONFIG_ROM_SIZE)"
+        print "   or turn off some features (such as hardware support not"
+        print "   needed) to make it fit.  Trying a more recent gcc version"
+        print "   might work too."
+        sys.exit(1)
 
     # Sanity checks
     start = symbols['code32flat_start'].offset
diff --git a/src/Kconfig b/src/Kconfig
index c40cc61..dde9b7c 100644
--- a/src/Kconfig
+++ b/src/Kconfig
@@ -122,6 +122,14 @@ endchoice
             selected, the memory is instead allocated from the
             "9-segment" (0x90000-0xa0000).
 
+    config ROM_SIZE
+        int "ROM size (in kB)"
+        default 256
+        help
+            Set the rom size.  Currently SeaBIOS will easily fit into 256k.
+            To make it fit it into 128k (which was big enougth for a long
+            time) you'll probably have to disable some featues.
+
 endmenu
 
 menu "Hardware support"
-- 
1.8.3.1