On 08/24/2012 06:58 PM, Tom Rini wrote:
> Takes the load function from arch/arm/cpu/armv7/omap-common/spl_nand.c
> instead.  This will allow for easier integration of SPL-boots-Linux code on
> other arches.
> 
> Signed-off-by: Tom Rini <tr...@ti.com>
> ---
> Changes in v4:
> - Leave nand_spl_load.c alone, move the new load into nand_spl_simple.c
[snip]
> +void spl_nand_load_image(void)
> +{
> +     struct image_header *header;
> +     int *src __attribute__((unused));
> +     int *dst __attribute__((unused));
> +
> +     nand_init();
> +
> +     /* use CONFIG_SYS_TEXT_BASE as temporary storage area */
> +     header = (struct image_header *)(CONFIG_SYS_TEXT_BASE);
> +#ifdef CONFIG_SPL_OS_BOOT
> +     if (!spl_start_uboot()) {
> +             /*
> +              * load parameter image
> +              * load to temp position since nand_spl_load_image reads
> +              * a whole block which is typically larger than
> +              * CONFIG_CMD_SPL_WRITE_SIZE therefore may overwrite
> +              * following sections like BSS
> +              */
> +             nand_spl_load_image(CONFIG_CMD_SPL_NAND_OFS,
> +                     CONFIG_CMD_SPL_WRITE_SIZE,
> +                     (void *)CONFIG_SYS_TEXT_BASE);
> +             /* copy to destintion */
> +             for (dst = (int *)CONFIG_SYS_SPL_ARGS_ADDR,
> +                             src = (int *)CONFIG_SYS_TEXT_BASE;
> +                             src < (int *)(CONFIG_SYS_TEXT_BASE +
> +                             CONFIG_CMD_SPL_WRITE_SIZE);
> +                             src++, dst++) {
> +                     writel(readl(src), dst);
> +             }
> +
> +             /* load linux */
> +             nand_spl_load_image(CONFIG_SYS_NAND_SPL_KERNEL_OFFS,
> +                     CONFIG_SYS_NAND_PAGE_SIZE, (void *)header);
> +             spl_parse_image_header(header);
> +             if (header->ih_os == IH_OS_LINUX) {
> +                     /* happy - was a linux */
> +                     nand_spl_load_image(CONFIG_SYS_NAND_SPL_KERNEL_OFFS,
> +                             spl_image.size, (void *)spl_image.load_addr);
> +                     nand_deselect();
> +                     return;
> +             } else {
> +                     puts("The Expected Linux image was not "
> +                             "found. Please check your NAND "
> +                             "configuration.\n");
> +                     puts("Trying to start u-boot now...\n");
> +             }
> +     }
> +#endif
> +#ifdef CONFIG_NAND_ENV_DST
> +     nand_spl_load_image(CONFIG_ENV_OFFSET,
> +             CONFIG_SYS_NAND_PAGE_SIZE, (void *)header);
> +     spl_parse_image_header(header);
> +     nand_spl_load_image(CONFIG_ENV_OFFSET, spl_image.size,
> +             (void *)spl_image.load_addr);
> +#ifdef CONFIG_ENV_OFFSET_REDUND
> +     nand_spl_load_image(CONFIG_ENV_OFFSET_REDUND,
> +             CONFIG_SYS_NAND_PAGE_SIZE, (void *)header);
> +     spl_parse_image_header(header);
> +     nand_spl_load_image(CONFIG_ENV_OFFSET_REDUND, spl_image.size,
> +             (void *)spl_image.load_addr);
> +#endif
> +#endif
> +     /* Load u-boot */
> +     nand_spl_load_image(CONFIG_SYS_NAND_U_BOOT_OFFS,
> +             CONFIG_SYS_NAND_PAGE_SIZE, (void *)header);
> +     spl_parse_image_header(header);
> +     nand_spl_load_image(CONFIG_SYS_NAND_U_BOOT_OFFS,
> +             spl_image.size, (void *)spl_image.load_addr);
> +     nand_deselect();
> +}

Will this refuse to link if spl_parse_image_header is not present, or
will gc-sections remove it before the error is given?  Does this
function leave any anonymous data that isn't cleaned up by gc-sections?
Again, this file must not grow for users that don't need the new features.

What is the benefit of putting this in nand_spl_simple.c versus another
file?  What if someone wants to use this with a different NAND boot
implementation?

-Scott


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