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chip-fel-flash.sh: add comments in the prepare_images function 

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
This commit is contained in:
Boris Brezillon 2015-06-25 17:56:46 +02:00
parent 564ca9482f
commit 589759577b
1 changed files with 5 additions and 0 deletions
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5
chip-fel-flash.sh
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@ -30,6 +30,10 @@ prepare_images() {
rm $out rm $out
fi fi
# The BROM cannot read 16K pages: it only reads 8k of data at most.
# Split the SPL image in 8k chunks and pad each chunk with 8k of random
# data to limit the impact of repeated patterns on the MLC chip.
dd if=$in of=$out bs=8k count=1 skip=0 conv=sync dd if=$in of=$out bs=8k count=1 skip=0 conv=sync
dd if=/dev/urandom of=$out bs=8k count=1 seek=1 conv=sync dd if=/dev/urandom of=$out bs=8k count=1 seek=1 conv=sync
dd if=$in of=$out bs=8k count=1 skip=1 seek=2 conv=sync dd if=$in of=$out bs=8k count=1 skip=1 seek=2 conv=sync
@ -38,6 +42,7 @@ prepare_images() {
dd if=/dev/urandom of=$out bs=8k count=1 seek=5 conv=sync dd if=/dev/urandom of=$out bs=8k count=1 seek=5 conv=sync
PADDED_SPL_SIZE=`stat --printf="%s" $out | xargs printf "0x%08x"` PADDED_SPL_SIZE=`stat --printf="%s" $out | xargs printf "0x%08x"`
# Align the u-boot image on a page boundary
dd if=$UBOOT of=$PADDED_UBOOT bs=16k conv=sync dd if=$UBOOT of=$PADDED_UBOOT bs=16k conv=sync
PADDED_UBOOT_SIZE=`stat --printf="%s" $PADDED_UBOOT | xargs printf "0x%08x"` PADDED_UBOOT_SIZE=`stat --printf="%s" $PADDED_UBOOT | xargs printf "0x%08x"`
} }