topic Re: jump using blhost in LPC Microcontrollers

jump using blhost

embedded_eng_ — Mon, 28 Jun 2021 12:16:07 GMT

Hi,

Im using blhost to jump to my image (execute).

the first 8 bytes of my bin file are: 00 00 01 20 71 01 00 00

So my command is:

./blhost -u 0x1fc9,0x0022 execute 0x00000171 0 0x20010000

Now, I've noticed that it will work with every address I pass to the command, for example:

./blhost -u 0x1fc9,0x0022 execute 0xaaaaaaaa 0 0x20010000

Why?

What is the correct way to do it?

Re: jump using blhost

embedded_eng_ — Tue, 29 Jun 2021 14:29:21 GMT

Someone?

Before the "execute" command, I'm running:

./blhost -u 0x1fc9,0x0022 write-memory 0x00000000 file.bin

Re: jump using blhost

Alice_Yang — Thu, 01 Jul 2021 10:57:59 GMT

Hello,

First one is correct.

Re: jump using blhost

embedded_eng_ — Sun, 04 Jul 2021 06:51:11 GMT

Hi, Thanks for the response.

Why does the jump command with an invalid address works as well?

Any Address that I've tried worked..

The commands fails only when I try a different stack pointer.

Another question:

Before the jump I'm writing to address 0x00000000, should I write instead to address 0x00000171 (taken from 8 first bytes)?

Thanks

Re: jump using blhost

Alice_Yang — Thu, 08 Jul 2021 03:15:24 GMT

Hello,

I'm not sure the inside processing of command "execute", I think the reason for "Why does the jump command with an invalid address works as well?" is your image start from 0x00000, so no matter the address is , it always start up from 0x0000, it can work well.

If image start from other address, for example, in mcu, a secondary bootloader +APP module, APP

start from 0x1000, then the <address> should the exactly data as User's Guide said.

Or image is in RAM, also <address> need read from first 8 bytes.

Alice