Copy SDRAM to flash and IAP memory reservation

[hiephuynh]

For IAP (In-app programming) to update firmware code to Flash Bank of a LPC43xx, do I need to write from SDRAM to SRAM to flash bank memory or can I just write from SDRAM->flash? 

Another question I have is in UM10503.pdf section "6.4.5.8 RAM used by IAP command handler", it looks like there's a requirement to reserve some RAM block for IAP commands.  What's the total size of memory application must reserve for IAP calls and is there some code example for this reservation for IAP? Appreciate your help.

[jeremyzhou]

Hi HIEP HUYNH,

Thank you for your interest in NXP Semiconductor products and 

the opportunity to serve you.

You should copy the data from SDRAM to SRAM before calling Copy RAM to Flash command.

About how much RAM area should be reserved when calling IAP commands, I think the section 6.4.5.8 RAM used by IAP command handler has illustrated it in details.

Have a great day,

TIC

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[hiephuynh]

Hi Jeremy, for "set active boot bank" IAP command, the datasheet says we need to reserve 2208 Bytes in RAM.  So I need to reserve 2208 B + additional bytes for other IAP commands like erase/prepare, etc?

Thanks

[jeremyzhou]

Hi HIEP HUYNH,

Thanks for your reply.

1) So I need to reserve 2208 B + additional bytes for other IAP commands like erase/prepare, etc?

     Yes, and 2456 B is the maximum size.
Have a great day,
TIC

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[hiephuynh]

Ok thanks. In order to do "Set Active Boot Bank" command,  in .icf Linker file, do I specify like this below to reserve the top 2456 Bytes for IAP calls?

define symbol LOCAL_SRAM_start__ = 0x10080000;
define symbol LOCAL_SRAM_end__  = 0x10089667;

[jeremyzhou]

Hi HIEP HUYNH,

Thanks for your reply.

In my opinion, It's not necessary to adapt the original linker file when calling the IAP commands.

Hope this is clear.

Have a great day,
TIC

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[hiephuynh]

Hi, so how would I reserve 2208 Bytes for this "Set Active Boot Bank" IAP command?  I'm using IAR Workbench.

[jeremyzhou · Accepted solution]

Hi HIEP HUYNH,

Thanks for your reply.

You can enlarge the size of the stack area via adapting the linker file, however I think the defaut size is large enough.

/*-Sizes-*/
define symbol __ICFEDIT_size_cstack__ = 0x2000;
define symbol __ICFEDIT_size_heap__   = 0x2000;
/**** End of ICF editor section. ###ICF###*/
‍‍‍‍

Have a great day,

TIC

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[hiephuynh]

My .icf has the same defines.  The "Set Active Boot Bank" command is also working for me now.  Thanks.