On Mon, Mar 11, 2013 at 10:15:00AM +0100, Steffen Trumtrar wrote:
> The bootrom only reads an image if the correct checksum is present in the
> header. The calculation is pretty simple:
> sum over all words from 0x20 to 0x44
> Two of this words are the image length. That is why the checksum can not be
> calculated until barebox_image_size is known.
> The easiest solution is a program that has to be run after make.
> Maybe this can be replaced with some linker-fu.
>
> Signed-off-by: Steffen Trumtrar <s.trumtrar@xxxxxxxxxxxxxx>
> ---
> scripts/Makefile | 1 +
> scripts/zynq_checksum.c | 55 +++++++++++++++++++++++++++++++++++++++++++++++++
> 2 files changed, 56 insertions(+)
> create mode 100644 scripts/zynq_checksum.c
>
> diff --git a/scripts/Makefile b/scripts/Makefile
> index 08b325c..41c892e 100644
> --- a/scripts/Makefile
> +++ b/scripts/Makefile
> @@ -12,6 +12,7 @@ hostprogs-$(CONFIG_ARCH_NETX) += gen_netx_image
> hostprogs-$(CONFIG_ARCH_OMAP) += omap_signGP mk-am35xx-spi-image
> hostprogs-$(CONFIG_ARCH_S5PCxx) += s5p_cksum
> hostprogs-$(CONFIG_ARCH_DAVINCI) += mkublheader
> +hostprogs-$(CONFIG_ARCH_ZYNQ) += zynq_checksum
>
> HOSTLOADLIBES_omap4_usbboot = -lpthread
> omap4_usbboot-objs := usb_linux.o omap4_usbboot.o
> diff --git a/scripts/zynq_checksum.c b/scripts/zynq_checksum.c
> new file mode 100644
> index 0000000..e814f86
> --- /dev/null
> +++ b/scripts/zynq_checksum.c
> @@ -0,0 +1,55 @@
> +#include <malloc.h>
> +#include <stdio.h>
> +#include <sys/stat.h>
> +
> +int main(int argc, char *argv[])
> +{
> + FILE *ifile, *ofile;
> + unsigned int *buf;
> + const char *infile;
> + const char *outfile;
> + struct stat st;
> + unsigned int i;
> + unsigned long sum = 0;
> +
> + infile = argv[1];
> + outfile = argv[2];
> +
> + stat(infile, &st);
> +
> + buf = malloc(sizeof(*buf) * st.st_size);
> + if (!buf) {
> + fprintf(stderr, "Unable to allocate buffer\n");
> + return -1;
> + }
> + ifile = fopen(infile, "rb");
> + if (!ifile) {
> + fprintf(stderr, "Cannot open %s for reading\n",
> + infile);
> + free(buf);
> + return -1;
> + }
> + ofile = fopen(outfile, "wb");
> + if (!ofile) {
> + fprintf(stderr, "Cannot open %s for writing\n",
> + outfile);
> + fclose(ifile);
> + free(buf);
> + return -1;
> + }
> +
> + fread(buf, 4, st.st_size, ifile);
> +
> + for (i = 0x8; i < 0x12; i++)
> + sum += buf[i];
endianess?
Sascha
--
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