Hi Lukasz
>> >> Since DFU is tighly coupled to u-boot infrastructure , the size
>> >> will increase due to multiple dependencies to compile u-boot DFU
>> >> source in SPL. Let me re-think on possibility and come back.
>>
>> >If you would need any assistance, please let me know (I don't have
>> >dra7x, but I do have Beagle Bone Black).
>>
>> The current implementation of dfu (drivers/dfu/dfu.c) relies on
>> environment modules (getenv,setenv), and hash algo methods. The
>> mandatory modules for DFU includes USB(dwc3/musb), gadget,
>> drivers/dfu, hash, environ modules. Added to this mmc/sf support, with
>> filesystem fat/ext4 would definitely increase the size.
>>
>I've double checked BBB SPL setup:
>- SPL is the MLO (./common/spl/)
>- Its size shall be less than 128 KiB
>- It can reside on eMMC (fat partition, raw LBA offset), NAND or be sent
> via serial port.
>I've build the am335x_boneblack_defconfig and MLO size is 75 KiB.
>Please correct me, but it seems that the SPL-DFU support adds around
>30 KiB to SPL binary size.
30KB+ is just approx size optimitzed for DFU-SF (qspi) support only, without
fat/ext4, mmc support.
But all device support may increase size.
>If yes, then even BBB's SPL can support DFU without any problems (105KiB < 128
>KiB).
You mean BBB must have 128KB ? Can you confirm.
If BBB is support SPI boot, flashing MLO/U-boot to SPI-flash through SPL-DFU/SF
would be sufficient right ?
Further dfu support for mmc/sd, ram available from u-boot.
>>I'm also wondering if we could even shrink the code more with reusing or
>>extending the code at ./common/spl/spl_{ext|fat|mmc|sf, etc}.c (in this way
>>we avoid adding the whole fat, ext, sf "commands").
Yes we must see this option. I will check on this.
>>For more aggressive size reduction we could for example disable hash algo
>>checking and add ./common/spl/spl_dfu.c file with ordinary functions and rid
>>of the need to add the whole dfu command.
>> I have tried minimal subset adding DFU-SF serial flash support alone
>> in SPL, this itself increases SPL size to 30K+ (SPL size approx.
>> 107KB for dra7x).
>>
>> But beagle bone IRAM would be around 64KB right? Definetly this will
>> not fit.
>>
>> Can we enable this feature for platform with minimum SRAM size of
>> 160KB. So SPL-DFU cannot be supported for platform less than 160KB
>> (like am335x).
>I will ask on ML if there is any other interested party in SPL-DFU support
>(and what are their limitations of SPL code size).
OK.
Regards
Ravi
_______________________________________________
U-Boot mailing list
U-Boot@lists.denx.de
http://lists.denx.de/mailman/listinfo/u-boot
