[U-Boot] [PATCH] ARM: socfpga: Fix FPGA bitstream loading code

Marek Vasut marex at denx.de
Wed Oct 9 20:47:37 UTC 2019


On 10/9/19 8:06 PM, Simon Goldschmidt wrote:
[...]
>>>>>>> Based on my understand through this register
>>>>>>> fpga_mgr_fpgamgrdata
>>>>>>> address map (0xFFCFE400-0xFFCFE7FF) on pg. 207 , the 256 bytes
>>>>>>> of
>>>>>>> FIFO
>>>>>>> buffer is mapping to above range addresses.
>>>>>> 0xFFCFE7FF-0xFFCFE400 = 0x400 = 1024 Bytes , not 256 . Why ?
>>>>> Finally, i have connected all scattered dot information from few
>>>>> internal docs. TheĀ register fpga_mgr_fpgamgrdata is actually a
>>>>> space in
>>>>> memory, acting like a buffer for the FPGA data. Regardless of the
>>>>> programming mode, data input from this buffer is translated into a
>>>>> 32-
>>>>> bit wide data path used by the configuration logic.
>>>> Does that mean that a write anywhere in 0xFFCFE400..0xFFCFE7FF ends
>>>> up
>>>> in the same register / FIFO ? Does that mean that whole address range
>>>> ignores the bottom 0x3ff MSbits ? Does it matter to which address in
>>>> that range the CPU writes the data or not ?
>>>
>>> Sorry, that's all information i have. Anyway, i have already engaged
>>> the HW engineer in the loop, and i will update you once i have more
>>> details.
>>
>> Thanks, let's wait and see ...
> 
> Have you dropped this? It's assigned to me in patchwork (I'm going
> through the list of old items assigned to me...).

I don't know, sorry. Apparently there isn't enough information to decide
whether this patch is correct or not.


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