[U-Boot] [PATCH v3 3/3] spl: dfu: reduce spl-dfu MLO size

[B, Ravi]

Hi Tom

>> >>  obj-$(CONFIG_USB_FUNCTION_DFU) += dfu.o
>> >> +ifndef CONFIG_SPL_BUILD
>> >>  obj-$(CONFIG_DFU_MMC) += dfu_mmc.o
>> >> +endif
>> >> +obj-$(CONFIG_SPL_DFU_MMC) += dfu_mmc.o
>> 
>> >This becomes obj-$(CONFIG_$(SPL_)DFU_MMC) += dfu_mmc.o
>> 
>> >> diff --git a/drivers/dfu/dfu_mmc.c b/drivers/dfu/dfu_mmc.c index 
>> >> 926ccbd..ba509db 100644
>> >> --- a/drivers/dfu/dfu_mmc.c
>> >> +++ b/drivers/dfu/dfu_mmc.c
>> > [snip]
>> >> @@ -154,7 +155,11 @@ static int mmc_file_op(enum dfu_op op, struct 
>> >> dfu_entity *dfu,
>> >>  
>> >>  	debug("%s: %s 0x%p\n", __func__, cmd_buf, cmd_buf);
>> >>  
>> >> +#if CONFIG_IS_ENABLED(DFU_MMC)
>> >> +	ret = cli_simple_run_command(cmd_buf, 0); #else
>> >>  	ret = run_command(cmd_buf, 0);
>> >> +#endif
>> 
>> >This doesn't make sense.  CONFIG_IS_ENABLED(DFU_MMC) is true for CONFIG_DFU_MMC or CONFIG_SPL_DFU_MMC.  Thanks!
>> 
>> True, My bad, I realized it lately after posting the patch.
>> 
>> I will use run_command() only, which abstrace use of both
>> simple_cli_xx() and hush_parser.
>> 
>> Since cli_hush.c is compile out for SPL to reduce the size.  SPL must 
>> use simple_cli_xx().
>> Since by default CONFIG_HUSH_PARSER is defined for both SPL/U-BOOT, 
>> this leads to compile error. I need to fix this way.

>We keep running into problems due to trying to whack in what to do in DFU via command rather than via API.  Can you make an attempt to convert things over, in both SPL and not SPL, in DFU to using ABI instead, to see if we can get the size reduction here still, and >not have to try and put fragile to other use cases ifdefs in common code?  Thanks!

Use of  direct mmc read/write API instead of using the run_command() is not feasible in this case.  As the DFU does read/write to mmc through fat/ext4 files system, uses "fatload/fatwrite" or "ext4load/ext4write" command to perform read/write to specific partition of mmc device. I think use of run_command() is more appropriate.

Regards
Ravi