MPC5746C Boot Assist Flash (BAF)

cholland — Tue, 10 Jul 2018 19:35:28 GMT

So, I am starting my foray into figuring out how to get the Boot Assist Flash to work.

Well, from what I understand, if the Boot Header is not found, the BAF will perform a Serial boot.

The Serial boot requires a BAF formatted file.

I figured out how to get the flash driver to work, which allowed me to erase the Boot header.

So, hopefully I am now in Serial boot mode. (Maybe S32 has some way to just erase the flash w/o programming?)

I figured out how to get an srec formatted file out of S32 Design Studio.

I noticed that addresses were not contiguous, so I checked a couple of ticks in S32 Design studio

That seemed to make the addresses contiguous.

Next, I chopped it up the .SREC file to leave just the code bytes.

I then added the Password, Load address, VLE bit and program byte length

as shown below.

///////// Original SREC Formatted File /////////////

S014000050524A5F4D504335373436422E73726563CD
S31501002C007068E00070E8E0001C6302841CE702843F

....

S70501000000F9

///////// BAF Formatted File /////////////

FEEDFACECAFEBEEF
01000000
8001D3D5
7068E00070E8E0001C6302841CE70284

....

0102431C01

I am using the EVB board, so the external xtal is 80 Mhz, which means I would need 96,000 baud.

I was able to just type in the baud rate on Tera Term VT so hopefully that works.

I tried sending a file or just sending the password and hope for some echo, but I don't see anything and I am wondering what, if anything, I am doing wrong.

I don't know if anybody else has tried this? I don't see any examples.

There's not too much discussion of BAF.

Hopefully I am headed in the right direction.

Thanks for your help.

Re: MPC5746C Boot Assist Flash (BAF)

petervlna — Wed, 11 Jul 2018 05:12:09 GMT

Hi,

are you sure you have 80MHz XTAL?

Peter

Re: MPC5746C Boot Assist Flash (BAF)

cholland — Wed, 11 Jul 2018 11:38:40 GMT

Peter,

You are correct. I am mistaken. It is indeed 40 MHz.

Other than the xtal, does it look like I am on the right track?

Thanks,

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MPC5746C Boot Assist Flash (BAF)

Re: MPC5746C Boot Assist Flash (BAF)

Re: MPC5746C Boot Assist Flash (BAF)