Modified bootloader for my own boad

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Modified bootloader for my own boad

(17 posts) (4 voices)

Started 3 years ago by blackswords
Latest reply from blackswords

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blackswords
Member

Hi everybody,

I have a STM32F103VC board and I would like to use it with MapleIDE.
Since the pins are not the same on maple boards and mine, I modified the bootloader to get it works with my board. I didn't like how pins are configured and used so I imported some files from the ST Library and after some tweaks, I managed to get it works.

After that, I added a board to MapleIDE by adding and modifying the necessary files. Now, I compile my code then send it to the board (I can the see the led blinking faster) but after that, the board generates a reset and then re-goes into the bootloader mode, waiting for a program to be uploaded instead of jumping to the program... (I checked these steps with my debugger)

I don't understand what could be wrong so if you have any idea on how to fix that, I'll be glad to hear it.

You can download the modified bootloader here if needed : http://www.mediafire.com/download.php?w0g6n9dvzfg3wnr

Thanks

Posted 3 years ago #
ala42
Member
You did start with a boot loader capable of supporting high density devices as needed for your 'C' CPU or did you start with a boot loader for a low density 'B' CPU ? They differ in the size of the flash pages, so the standard boot loader will not work.

This
config.h(53): #define USER_CODE_FLASH ((u32)0x08007000)
is non standard. Did you change the linker scripts to change the code base from 0x08005000 to 0x08007000 ?

This code part
```
bool flashErasePages(u32 pageAddr, u16 n) {
	while (n-->0) {
		if (!flashErasePage(pageAddr+0x400*n)) {
			return FALSE;
		}
	}

	return TRUE;
}
```
looks like a low density code using 1KB flash pages, which does not match you high density CPU.
Posted 3 years ago #
blackswords
Member

In fact I didn't know there are two versions of the bootloader so I think I picked up the wrong one. So I modified the page size to 0x800 in the function mentioned but there are any other places that it should be modified?

Yes I modified the liker script to start at 0x8007000 but I can see that in the uploading :

Opening USB Device 0x1eaf:0x0003...
Found Runtime: [0x1eaf:0x0003] devnum=0, cfg=0, intf=0, alt=1, name="DFU Program FLASH 0x08005000"
Claiming USB DFU Interface...
Setting Alternate Setting ...
Determining device status: state = dfuIDLE, status = 0
dfuIDLE, continuing
Transfer Size = 0x0400
bytes_per_hash=286
Starting download: [##################################################] finished!
state(8) = dfuMANIFEST-WAIT-RESET, status(0) = No error condition is present
Done!
Resetting USB to switch back to runtime mode

MapleIDE upload 1Kb pages instead of 2Kb, where can I modifiy this please?

Posted 3 years ago #
mbolivar
LeafLabs

The bootloader repository is a mess; sorry for all the trouble you've been having.

I'm away from my development box right now, so I can't answer your question directly, but if you're targeting a high-density STM32F1, you should start with one of the maple-bootloader branches for a high-density board, like the native-boot (for Maple Native) or maple-ret6 (for Maple RET6 Ed.) branches. That should take care of the problems you've been having with flash page size.

Posted 3 years ago #
ala42
Member

> Yes I modified the liker script to start at 0x8007000 but I can see that in the uploading :
It is a very bad idea to make such changes with a boot loader that did not work before. Roll back to standard addresses, flash your program using USB and read it back using the build in serial boot loader over USART1 with the STM Flash Loader Demo tool and compare the binaries.

>Found Runtime: [0x1eaf:0x0003] devnum=0, cfg=0, intf=0, alt=1, name="DFU Program FLASH 0x08005000"
I adapted the text "DFU Program FLASH 0x08005000" which is defined in usb_descriptor.c when I changed the start address, and IIRC it was a necessary change, not just cosmetics.

Posted 3 years ago #
blackswords
Member

I recompile the bootloader with the optimization for size turned on and the size is now less than 0x5000 bytes so I changed my linker script to put the code to 0x8005000 as it should be. I changed the wTransferSize to 0x0800 too. But now I still have a problem, when I launch the upload via the bootloader, it get stuck here :

void dfuFinishUpload() {
while (1) {
if (userFlash) {
if (code_copy_lock == BEGINNING) {
code_copy_lock=MIDDLE;
strobePin(LED_BANK,LED,2,0x1000);
dfuCopyBufferToExec();
strobePin(LED_BANK,LED,2,0x500);
code_copy_lock = END;
}
}
/* otherwise do nothing, dfu state machine resets itself */
}
}

When I check the value of code_copy_lock in the memory, it seems to be 2 so 'END'.
USER_FLASH = TRUE.
userFirmwareLen is equal to 2048 so only one packet was transfered.

This is the output of MapleIDE :

Opening USB Device 0x1eaf:0x0003...
Found Runtime: [0x1eaf:0x0003] devnum=0, cfg=0, intf=0, alt=1, name="DFU Program FLASH 0x08005000"
Claiming USB DFU Interface...
Setting Alternate Setting ...
Determining device status: state = dfuIDLE, status = 0
dfuIDLE, continuing
Transfer Size = 0x0800
bytes_per_hash=285
Error during download get_status
Starting download: [#######

Do you have an idea of what could be wrong?

EDIT : In fact, the second packet is received but not written to Flash

Posted 3 years ago #
ala42
Member

The boot loader fits with the default optimization settings into the first $5000 bytes of code, even fits in the first $4000 bytes. When you optimize for size it gets a lot smaller, but does not work anymore.
Keep it simple and just change as few as possible to get it running at all. Start with the RET6 boot loader, it should work out of the box.

Posted 3 years ago #
blackswords
Member

Okay, where can I find the RET6 bootloader? I only found the one on git hub. I'll try to fix the one I have to use it without optimizations

Posted 3 years ago #
ala42
Member

http://lmgtfy.com/?q=+RET6+bootloader+git+hub

Posted 3 years ago #
blackswords
Member

Thanks but I need the sources of the RET6 version to remap the LED, the button and USB Connect pin, I only found the binary version of the RET6 bootloader (here https://github.com/leaflabs/leaflabs-docs/blob/master/source/bootloader.rst#id34)

Posted 3 years ago #
mbolivar
LeafLabs

the first result of the google search ala42 pointed you towards is a forum thread explaining how to get the RET6 sources. please remember to search the forum to see if your question has already been answered.

the short answer is that RET6 bootloader sources are in the maple-ret6 branch of the maple-bootloader git repository, as i explained in my earlier post:

you should start with one of the maple-bootloader branches for a high-density board, like the native-boot (for Maple Native) or maple-ret6 (for Maple RET6 Ed.) branches

i'll leave you to read up on git to figure out how to checkout the maple-ret6 branch ;).

Posted 3 years ago #
blackswords
Member

Oh I'm sorry, I'm not used to git and I didn't see the branches part. I found the bootlader, I'll check that and post some results

Posted 3 years ago #
anton
Member

Ala, have you ported bootloader to F4?

Posted 3 years ago #
blackswords
Member

So sorry, I don't have any F4 devices so I can't try.

Posted 3 years ago #
mbolivar
LeafLabs

the bootloader won't work on F4; the USB peripheral is different.

Posted 3 years ago #

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