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 | 72 +++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 73 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..f32db61
--- /dev/null
+++ b/scripts/zynq_checksum.c
@@ -0,0 +1,72 @@
+#include <endian.h>
+#include <errno.h>
+#include <malloc.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/stat.h>
+
+static void usage(char *name)
+{
+ printf("Usage: %s barebox.bin <outfile>\n", name);
+}
+
+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;
+
+ if (argc != 3) {
+ usage(argv[0]);
+ exit(1);
+ }
+
+ infile = argv[1];
+ outfile = argv[2];
+
+ if (stat(infile, &st) == -1) {
+ perror("stat");
+ exit(EXIT_FAILURE);
+ }
+
+ 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);
+ exit(EXIT_FAILURE);
+ }
+ ofile = fopen(outfile, "wb");
+ if (!ofile) {
+ fprintf(stderr, "Cannot open %s for writing\n",
+ outfile);
+ fclose(ifile);
+ free(buf);
+ exit(EXIT_FAILURE);
+ }
+
+ fread(buf, 4, st.st_size, ifile);
+
+ for (i = 0x8; i < 0x12; i++)
+ sum += htole32(buf[i]);
+
+ sum = ~sum;
+ buf[i] = sum;
+
+ fwrite(buf, st.st_size / 4, 4, ofile);
+
+ fclose(ofile);
+ fclose(ifile);
+ free(buf);
+
+ return 0;
+}
--
1.8.2.rc2
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