[U-Boot] Odroid XU3 - exynos5422 - SPL - iRAM/sRAM address

[Joonyoung Shim]

Hi Suriyan,

On 01/23/2015 10:46 AM, Suriyan Ramasami wrote:
> On Thu, Jan 22, 2015 at 9:51 AM, Kevin Hilman <khilman at kernel.org> wrote:
>> Suriyan Ramasami <suriyan.r at gmail.com> writes:
>>
>>> Hello Kevin,
>>>
>>> On Wed, Jan 21, 2015 at 4:54 PM, Kevin Hilman <khilman at kernel.org> wrote:
>>>> Hi Surijan,
>>>>
>>>> Suriyan Ramasami <suriyan.r at gmail.com> writes:
>>>>
>>>>> Hello Sjoerd Simons,
>>>>>    A signed BL2 which allows unsigned BL2 chain load is already
>>>>> available for experimentation. Refer this link:
>>>>> http://forum.odroid.com/viewtopic.php?f=98&t=6147#p58984
>>>>> The suriyan.bl2-hkxu3.1212.5422.zip blob contains a signed BL2 which
>>>>> allows the same.
>>>>>
>>>>> The layout of SD card is as follows:
>>>>>
>>>>> BL1 (1 to 30) 15K
>>>>> BL2 (31 to 62) 16K
>>>>> indicator block (63 to 64) 1K
>>>>> uboot (65 to 2112) 1M
>>>>> tzsw (2113 to 2624) 256K
>>>>> unsigned BL2 (2625 to 2656) 16K
>>>>>
>>>>> A non zero in the first byte of the indicator block instructs the
>>>>> signed BL2 to load the unsigned BL2 @ offset 2625.
>>>>
>>>> I took the binaries from your .zip file above and put them on the SD
>>>> card for my odroid-xu3 at the offsets above.  I'm using BL1 and TZSW
>>>> from the u-boot-hardkernel release[1] and using u-boot-dtb.bin from
>>>> my own mainline u-boot build which inclues the odroid-xu3 patches.
>>>>
>>>> If I leave the indicator block zero'd, everything works fine, and it
>>>> boots my version of mainline u-boot without any problems.
>>>>
>>>> If I then write a non-zero value to the first byte of the indicator
>>>> block and write your unsigned BL2 at the appropriate offset, it no
>>>> longer boots.  Is the unsigned BL2 supposed to boot u-boot at offset 65
>>>> when it's finished as well?
>>>>
>>>
>>> The unsigned SPL from mainline used will be spl/u-boot-spl.bin (raw
>>> jump to offset 0 in that file will be pure code without headers)
>>

Is it impossible the unsigned BL2(spl/smdk5422-spl.bin) file from
hardkernel u-boot with your chaining signed BL2?

>> OK.
>>
>>> Changes are needed in spl_boot.c to make it next load u-boot-dtb.bin.
>>>
>>> I shall try to list most of the changes here:
>>> 1.arch/arm/cpu/armv7/exynos/spl_boot.c:
>>>    The Odroid-XU3's IROM function pointers does not have any code
>>> (AFAICT). I checked the locations that are listed in the array table
>>> and found all 0's there.
>>>    We need to replace function copy_uboot_to_ram() with something
>>> similar from HK's file, so that it uses exynos_smc() calls to load the
>>> bits from SD card, or we could enable MMC code in SPL (haven't tried
>>> it) and use those functions instead.
>>>   For quick results,I just forced an SD card read.
>>>
>>> 2. #define CONFIG_SEC_FW_SIZE (15 << 10) /* 15 KB */
>>>  somewhere, so that the start offset for U-Boot is calculated correctly.
>>>
>>> 3. for chain loading we define CONFIG_SPL_TEXT_BASE to be, say
>>> 0x63E00000 so that when its executed the static global pointers are
>>> accessed correctly - static struct spl_machine_param machine_param in
>>> file smdk5420_spl.c.
>>>
>>> 4. mem_ctrl_init() hangs in while (val != FOUTBPLL);
>>>   One workaround is to use HKs version of this function which again
>>> uses some smc calls.
>>>
>>> With all these changes, SPL chainloading works.
>>
>> Do you have a patch against mainline u-boot for all these changes?  I'd
>> be happy to test.
>>
> 
> Give me some time and I shall iron out my notes and get back to
> creating a patch for this against mainline U-Boot.
> 

I'm also waiting. Thanks for your try.

Thanks.

>>>> How are you debugging your SPL images?
>>>>
>>>> I tried adding CONFIG_SPL_SERIAL_SUPPORT so I could printf from SPL, but
>>>> that doesn't compile because it seems that libfdt support is needed.
>>>>
>>>
>>> I didn't enable SERIAL SUPPORT for debugging. I did study the HK SPL
>>> code vs mainline SPL code quite a bit and worked from there.
>>> I can try to see if there is an easy way to enable serial printfs.
>>
>> Are there any GPIO LEDs to blink?
>>
> 
> It does have some LEDs.
> 
>> Thanks,
>>
>> Kevin
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