[U-Boot] powerpc/CoreNet: Allow pbl images to take u-boot images != 512K

[Andy Fleming]

On Mon, May 27, 2013 at 10:51:46AM +1200, Chris Packham wrote:
> From: Chris Packham <chris.packham at alliedtelesis.co.nz>
> 
> Instead of assuming that SYS_TEXT_BASE is 0xFFF80000 calculate the initial
> pbl command offset by subtracting the image size from the top of the
> 24-bit address range. Also increase the size of the memory buffer to
> accommodate a larger output image.
> 
> Signed-off-by: Chris Packham <chris.packham at alliedtelesis.co.nz>

I've applied this (thanks), but I'll note it had a warning about unused
variable "size". Because it was unused. Please build-test any patches,
and ensure they are free of warnings.
> + * The PBL can load up to 64 bytes at a time, so we split the U-Boot
> + * image into 64 byte chunks. PBL needs a command for each piece, of
> + * the form "81xxxxxx", where "xxxxxx" is the offset. Calculate the
> + * start offset by subtracting the size of the u-boot image from the
> + * top of the allowable 24-bit range.
> + */
> +static void init_next_pbl_cmd(FILE *fp_uboot)
> +{
> +	struct stat st;
> +	int fd = fileno(fp_uboot);
> +	size_t size;

This was the variable, for future reference.

> +
> +	if (fstat(fd, &st) == -1) {
> +		printf("Error: Could not determine u-boot image size. %s\n",
> +			strerror(errno));
> +		exit(EXIT_FAILURE);
> +	}
> +
> +	next_pbl_cmd = 0x82000000 - st.st_size;
> +}

Andy