[PATCH v2 7/9] powerpc/ps3: Add check for otheros image size

[Geoff Levand]

The ps3's otheros flash loader has a size limit of 16 MiB for the
uncompressed image.  If that limit will be reached output the
flash image file as 'otheros-too-big.bld'.

Signed-off-by: Geoff Levand <geoff at infradead.org>
---
 arch/powerpc/boot/wrapper | 17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/boot/wrapper b/arch/powerpc/boot/wrapper
index 35ace40d9fc2..ab1e3ddc79f3 100755
--- a/arch/powerpc/boot/wrapper
+++ b/arch/powerpc/boot/wrapper
@@ -571,7 +571,20 @@ ps3)
         count=$overlay_size bs=1
 
     odir="$(dirname "$ofile.bin")"
-    rm -f "$odir/otheros.bld"
-    gzip -n --force -9 --stdout "$ofile.bin" > "$odir/otheros.bld"
+
+    # The ps3's flash loader has a size limit of 16 MiB for the uncompressed
+    # image.  If a compressed image that exceeded this limit is written to
+    # flash the loader will decompress that image until the 16 MiB limit is
+    # reached, then enter the system reset vector of the partially decompressed
+    # image.  No warning is issued.
+    rm -f "$odir"/{otheros,otheros-too-big}.bld
+    size=$(${CROSS}nm --no-sort --radix=d "$ofile" | egrep ' _end$' | cut -d' ' -f1)
+    bld="otheros.bld"
+    if [ $size -gt $((0x1000000)) ]; then
+        bld="otheros-too-big.bld"
+        echo "  INFO: Uncompressed kernel is too large to program into PS3 flash memory;" \
+        "size=0x$(printf "%x\n" $size), limit=0x1000000."
+    fi
+    gzip -n --force -9 --stdout "$ofile.bin" > "$odir/$bld"
     ;;
 esac
-- 
2.20.1