imx-image: handle i.MX35 special case

From the i.MX35 user manual :
Since MLC NAND Flash devices do not guarantee error-free boot blocks,
the i.MX35 boot code requires that the first 4 Kbytes of boot code be
duplicated in a subsequent block to serve as a second copy option.

Actually imx-image puts the image at 4k but it seems that the i.MX35
bootrom copies only from 8k as it expects that there is a copy of the
first 0-4k in 4k-8k (and is supposed to use this copy if there is an
ECC error in the first 4k) as we can see in the following lines :

barebox@Eukrea CPUIMX35:/  md -s /dev/nand0 0x0
00000000: ea0003fe eafffffe eafffffe eafffffe                ................
00000010: eafffffe eafffffe eafffffe eafffffe                ................
00000020: 65726162 00786f62 00000000 00000000
barebox.........

=-> header is @ 0 in flash

barebox@Eukrea CPUIMX35:/  md -s /dev/nand0 0x1000
00001000: 56341200 00000000 0001eda1 00000000                ..4V............
00001010: 00000000 00000000 00000000
00000000                ................

=-> so we have data @ 0x1000 in flash

barebox@Eukrea CPUIMX35:/  md 0x87f00000
87f00000: 00000000 00000000 00000000 00000000                ................
87f00010: 00000000 00000000 00000000
00000000                ................

=-> but we don't find this data in RAM

barebox@Eukrea CPUIMX35:/  md -s /dev/nand0 0x2000
00002000: ea000012 eafffffe eafffffe eafffffe                ................
00002010: eafffffe eafffffe eafffffe eafffffe                ................
00002020: 65726162 00786f62 00000000 00034272
barebox.....rB..

=-> so we have the image @ 0x2000 in flash

barebox@Eukrea CPUIMX35:/  md 0x87f01000
87f01000: ea000871 eafffffe eafffffe eafffffe                q...............
87f01010: eafffffe eafffffe eafffffe eafffffe                ................
87f01020: 65726162 00786f62 87f02000 0003b520                barebox.. .. ...

=-> and we find it in RAM

Signed-off-by: Eric Bénard <eric@eukrea.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 16 insertions, 5 deletions

diff --git a/scripts/imx/imx-image.c b/scripts/imx/imx-image.c
index d1db51780f..1f37fe20bc 100644
--- a/scripts/imx/imx-image.c
+++ b/scripts/imx/imx-image.c
@@ -37,6 +37,7 @@ static uint32_t image_dcd_offset;
 static uint32_t dcdtable[MAX_DCD];
 static int curdcd;
 static int header_version;
+static int cpu_type;
 static int add_barebox_header;
 
 /*
@@ -448,14 +449,15 @@ static int do_dcd_offset(int argc, char *argv[])
 struct soc_type {
 	char *name;
 	int header_version;
+	int cpu_type;
 };
 
 static struct soc_type socs[] = {
-	{ .name = "imx25", .header_version = 1, },
-	{ .name = "imx35", .header_version = 1, },
-	{ .name = "imx51", .header_version = 1, },
-	{ .name = "imx53", .header_version = 2, },
-	{ .name = "imx6", .header_version = 2, },
+	{ .name = "imx25", .header_version = 1, .cpu_type = 25},
+	{ .name = "imx35", .header_version = 1, .cpu_type = 35 },
+	{ .name = "imx51", .header_version = 1, .cpu_type = 51 },
+	{ .name = "imx53", .header_version = 2, .cpu_type = 53 },
+	{ .name = "imx6", .header_version = 2, .cpu_type = 6 },
 };
 
 static int do_soc(int argc, char *argv[])
@@ -471,6 +473,7 @@ static int do_soc(int argc, char *argv[])
 	for (i = 0; i < ARRAY_SIZE(socs); i++) {
 		if (!strcmp(socs[i].name, soc)) {
 			header_version = socs[i].header_version;
+			cpu_type = socs[i].cpu_type;
 			return 0;
 		}
 	}
@@ -761,6 +764,14 @@ int main(int argc, char *argv[])
 		exit(1);
 	}
 
+	if (cpu_type == 35) {
+		ret = xwrite(outfd, buf, 4096);
+		if (ret < 0) {
+			perror("write");
+			exit(1);
+		}
+	}
+
 	infd = open(imagename, O_RDONLY);
 	if (infd < 0) {
 		perror("open");