From 5761eaa3a5ae3c7ea796add73b86176b7c963cca Mon Sep 17 00:00:00 2001 From: Geoff Levand Date: Fri, 28 Mar 2008 07:41:45 +1100 Subject: [POWERPC] PS3: Bootwrapper improvements Improve the debugging support of the PS3 bootwraper code: o Increase the size of the PS3 bootwrapper overlay from 256 to 512 bytes to allow for more debugging code in the overlay. o Use the dot symbol to set the size of __system_reset_overlay. The assembler will then emit an error if the overlay code is too big. o Remove some unused instructions. o Update the text describing the PS3 bootwrapper overlay. o Add a check for null pointer writes. o Change hcall return value from s64. Signed-off-by: Geoff Levand Signed-off-by: Paul Mackerras --- arch/powerpc/boot/wrapper | 21 +++++++++++---------- 1 file changed, 11 insertions(+), 10 deletions(-) (limited to 'arch/powerpc/boot/wrapper') diff --git a/arch/powerpc/boot/wrapper b/arch/powerpc/boot/wrapper index 03b474bfe747..087e120e4904 100755 --- a/arch/powerpc/boot/wrapper +++ b/arch/powerpc/boot/wrapper @@ -298,15 +298,16 @@ treeboot*) exit 0 ;; ps3) - # The ps3's loader supports loading gzipped binary images from flash - # rom to addr zero. The loader enters the image at addr 0x100. A - # bootwrapper overlay is use to arrange for the kernel to be loaded - # to addr zero and to have a suitable bootwrapper entry at 0x100. - # To construct the rom image, 0x100 bytes from offset 0x100 in the - # kernel is copied to the bootwrapper symbol __system_reset_kernel. - # The 0x100 bytes at the bootwrapper symbol __system_reset_overlay is - # then copied to offset 0x100. At runtime the bootwrapper program - # copies the 0x100 bytes at __system_reset_kernel to addr 0x100. + # The ps3's loader supports loading a gzipped binary image from flash + # rom to ram addr zero. The loader then enters the system reset + # vector at addr 0x100. A bootwrapper overlay is used to arrange for + # a binary image of the kernel to be at addr zero, and yet have a + # suitable bootwrapper entry at 0x100. To construct the final rom + # image 512 bytes from offset 0x100 is copied to the bootwrapper + # place holder at symbol __system_reset_kernel. The 512 bytes of the + # bootwrapper entry code at symbol __system_reset_overlay is then + # copied to offset 0x100. At runtime the bootwrapper program copies + # the data at __system_reset_kernel back to addr 0x100. system_reset_overlay=0x`${CROSS}nm "$ofile" \ | grep ' __system_reset_overlay$' \ @@ -317,7 +318,7 @@ ps3) | cut -d' ' -f1` system_reset_kernel=`printf "%d" $system_reset_kernel` overlay_dest="256" - overlay_size="256" + overlay_size="512" ${CROSS}objcopy -O binary "$ofile" "$ofile.bin" -- cgit v1.2.3-59-g8ed1b