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ARM: AM33xx: swap MLO SPI image automatically 

The MLO image for SPI differs in the normal MLO in that the
SPI version is big endian. As both types of images are floating
around detect whether or not the image is swapped automatically.
This also adds a check whether we have a valid MLO image.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Sascha Hauer 2014-05-15 12:21:40 +02:00
parent 2bea297d30
commit 22b722902c
1 changed files with 14 additions and 1 deletions
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15
arch/arm/mach-omap/am33xx_bbu_spi_mlo.c
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@ -32,6 +32,18 @@ static int spi_nor_mlo_handler(struct bbu_handler *handler,
uint32_t readbuf;
int size = data->len;
void *image = data->image;
uint32_t *header;
int swap = 0;
header = data->image;
if (header[5] == 0x43485345) {
swap = 0;
} else if (header[5] == 0x45534843) {
swap = 1;
} else {
if (!bbu_force(data, "Not a MLO image"))
return -EINVAL;
}
dstfd = open(data->devicefile, O_WRONLY);
if (dstfd < 0) {
@ -49,7 +61,8 @@ static int spi_nor_mlo_handler(struct bbu_handler *handler,
for (; size >= 0; size -= 4) {
memcpy((char *)&readbuf, image, 4);
readbuf = cpu_to_be32(readbuf);
if (swap)
readbuf = cpu_to_be32(readbuf);
ret = write(dstfd, &readbuf, 4);
if (ret < 0) {
perror("write");