[U-Boot] [RFC PATCH 6/7] omap: common spl support for OMAP3/4

[Aneesh V]

Dear Andreas,

On Thursday 30 June 2011 12:38 PM, Andreas Bießmann wrote:
> Dear Aneesh V,
>
> Am 30.06.2011 um 08:12 schrieb Aneesh V:
>
>> Hi Heiko,
>>
>> On Thursday 30 June 2011 11:31 AM, Heiko Schocher wrote:
>>> Hello Aneesh,
>>>
>>> Aneesh V wrote:
>>>> Signed-off-by: Aneesh V<aneesh at ti.com>
>>>> ---
>>>>   arch/arm/cpu/armv7/omap-common/Makefile |    9 ++--
>>>>   arch/arm/cpu/armv7/omap-common/spl.c    |   56 ++++++++++++++++++++++++++++
>>>>   arch/arm/cpu/armv7/omap-common/spl.lds  |   62 +++++++++++++++++++++++++++++++
>>>>   3 files changed, 123 insertions(+), 4 deletions(-)
>>>>   create mode 100644 arch/arm/cpu/armv7/omap-common/spl.c
>>>>   create mode 100644 arch/arm/cpu/armv7/omap-common/spl.lds
>>>>
>>> [...]
>>>> diff --git a/arch/arm/cpu/armv7/omap-common/spl.c b/arch/arm/cpu/armv7/omap-common/spl.c
>>>> new file mode 100644
>>>> index 0000000..b5a5f3c
>>>> --- /dev/null
>>>> +++ b/arch/arm/cpu/armv7/omap-common/spl.c
>>> [...]
>>>> @@ -0,0 +1,56 @@
>>>> +void board_init_f(ulong dummy)
>>>> +{
>>>> +	debug(">>board_init_f()\n");
>>>> +	relocate_code(CONFIG_SYS_SPL_STACK,&gdata, CONFIG_SYS_SPL_TEXT_BASE);
>>>> +	debug("<<board_init_f()\n");
>>>
>>> This debug printf will never occur ;-)
>>
>> Indeed. Thanks for pointing out.
>>
>>>
>>> BTW: Do you really need to relocate code? You could just load the 2nd
>>> stage loader to ram from board_init_f, or?
>>
>> I am passing the same address as I am executing from as the target for
>> the relocation, so the relocation will not happen, instead BSS will be
>> initialized. That's what I am calling it for. Initially I had my own
>> routine for clearing BSS. Then I decided to re-use it from start.S
>
> So you could just call clear_bss(void) and skip relocate_code. But I think you need to adopt the __bss_start_ofs, __bss_end_ofs markers, cause your linker skript places them in SDRAM.

Is that really needed, or is it ok to just comment this fact clearly as
Heiko suggested?

>
> BTW: I think Simon Schwarz is also working on this, can one comment on his first version of patchset?

We have decided to co-ordinate our work so that there won't be any
duplication of efforts. As per this plan, these parts will be taken
care in my OMAP4 MMC spl series and then he will extend it for OMAP3
and NAND.

best regards,
Aneesh