[U-Boot] [PATCH V8 3/9] omap-common: add nand spl support

[Aneesh V <aneesh@ti.com>]

Hi Simon,

On Monday 08 August 2011 01:20 PM, Simon Schwarz wrote:
> Hi Aneesh,
>
> On 08/05/2011 09:30 AM, Aneesh V wrote:
>> Hi Simon,
>>
>> Sorry if my response is late. I was not in office for couple of days.
>
> First day in office since vacation - so no you are not late ;)
>
>>
>> On Tuesday 02 August 2011 09:29 PM, Simon Schwarz wrote:
>>> Add NAND support for the new SPL structure.
>>>
>>> Signed-off-by: Simon Schwarz<simonschwarzcor@gmail.com>
>>> ---
>>> This patch didn't exist before V2!
>>>
>>> V2 changes:
>>> ADD Some define-barriers for OMAP3 to only use NAND
>>> ADD nand_load_image() - inits the OMAP gpmc, loads the images - parses
>>> the
>>> header
>>> CHG cosmetic
>>> ADD do_reset() implementation for omap-common spl
>>> ADD nand_copy_image to nand.h
>>> ADD CPP barriers for mmc and nand support. The parts depending on
>>> library
>>> support are only compiled if the respective library is included.
>>>
>>> V3 changes:
>>> ADD Comment why setup_clocks_for_console() isn't called for OMAP3
>>> CHG cosmetic (deleted empty line)
>>> CHG rename of NAND_MODE_HW to NAND_MODE_HW_ECC
>>> DEL NAND_MODE_SW. Not used.
>>>
>>> V4 changes:
>>> CHG cosmetic - style problems
>>>
>>> V5 changes:
>>> CHG renamed nand_copy_image to nand_spl_load_image
>>> CHG offs paramter of nand_spl_load_image is of type loff_t now
>>>
>>> V6 changes:
>>> ADD call to nand_deselect after loading the images
>>> ADD nand_deselect to nand.h
>>>
>>> V7 changes:
>>> DEL some CONFIG_SPL_* relying on garbage collection now
>>> ADD mmc_load_image and nand_load_image now have
>>> __attribute__((unused)) to
>>> prevent warnings when the lib is not added to SPL
>>> DEL do_reset() isn't used anymore
>>> CHG header based loading in SPL
>>>
>>> V8 changes:
>>> DEL nand_spl_read_page is replaced by nand_spl_load_image with
>>> size=page size
>>>
>>> Transition from V1 to V2 also includes that this patch is now based on
>>> - the new SPL layout by Aneesh V and Daniel Schwierzeck
>>> - the OMAP4 SPL patches by Aneesh V
>>> ---
>>> arch/arm/cpu/armv7/omap-common/spl.c | 46
>>> +++++++++++++++++++++++++++++++++-
>>> arch/arm/include/asm/omap_common.h | 1 +
>>> include/nand.h | 3 ++
>>> 3 files changed, 49 insertions(+), 1 deletions(-)
>>>
>>> diff --git a/arch/arm/cpu/armv7/omap-common/spl.c
>>> b/arch/arm/cpu/armv7/omap-common/spl.c
>>> index 1d301f4..53d10bf 100644
>>> --- a/arch/arm/cpu/armv7/omap-common/spl.c
>>> +++ b/arch/arm/cpu/armv7/omap-common/spl.c
>>> @@ -26,6 +26,7 @@
>>> #include<asm/u-boot.h>
>>> #include<asm/utils.h>
>>> #include<asm/arch/sys_proto.h>
>>> +#include<nand.h>
>>> #include<mmc.h>
>>> #include<fat.h>
>>> #include<timestamp_autogenerated.h>
>>> @@ -173,7 +174,7 @@ end:
>>> hang();
>>> }
>>> }
>>> -
>>> +static void mmc_load_image(void) __attribute__((unused));
>>> static void mmc_load_image(void)
>>> {
>>> struct mmc *mmc;
>>> @@ -207,12 +208,48 @@ static void mmc_load_image(void)
>>> }
>>> }
>>>
>>> +#ifdef CONFIG_SPL_NAND_SUPPORT
>>> +static void nand_load_image(void) __attribute__ ((unused));
>>> +static void nand_load_image(void)
>>> +{
>>> + struct image_header *header;
>>> +
>>> + gpmc_init();
>>> + nand_init();
>>> +
>>> + /*use CONFIG_SYS_TEXT_BASE as temporary storage area */
>>> + header = (struct image_header *)(CONFIG_SYS_TEXT_BASE);
>>> +
>>> +#ifdef CONFIG_NAND_ENV_DST
>>> + nand_spl_load_image(CONFIG_ENV_OFFSET,
>>> + CONFIG_SYS_NAND_PAGE_SIZE, (void *)header);
>>> + parse_image_header(header);
>>> + nand_spl_load_image(CONFIG_ENV_OFFSET, image_size,
>>> + (void *)image_load_addr);
>>> +#ifdef CONFIG_ENV_OFFSET_REDUND
>>> + nand_spl_load_image(CONFIG_ENV_OFFSET_REDUND,
>>> + CONFIG_SYS_NAND_PAGE_SIZE, (void *)header);
>>> + parse_image_header(header);
>>> + nand_spl_load_image(CONFIG_ENV_OFFSET_REDUND, image_size,
>>> + (void *)image_load_addr);
>>> +#endif
>>> +#endif
>>
>> Can you please explain the logic here. What are you loading here?
>
> This is from the old nand_spl.c. AFAIK this is to load the environment
> from NAND to RAM. I kept this to not break boards using it - although
> there has to be some other mechanism for this because it is only used in
> smdk6400.h.
>
> The REDUND part does the same for a redundant copy. (docs say: to have a
> working copy if power fails while doing saveenv).

Hmm. Looks like this was a support added by the commit b74ab737. So, we
are pre-loading the ENV for u-boot here.

best regards,
Aneesh