bootloader and then ?

[phil123456]

Hello,

• I wired an FTDI dongle (3v) to my rpi
• I added a reset switch
• I copied your bootloader.img as a kernel.img
• I set putty to 115200 baud

I pasted the blinker01/notmain.srec into putty,

I press 'g' (right?) the program is supposed to be running ?

cos it redisplay the SREC message and that's it

[louigi600]

I don't think the author looks here ... maybe you will have better luck on RPI forums.
I'm curious did you get the bootloader thing to work ?

[dwelch67]

You did a raw/ascii download of the srec file?

[alvaroarenas]

Hi @dwelch67

I am also interested in getting the bootloader to work. I successfully got the blinker01 working.

Could you explain in detail the commands you use in minicom. I did:

• Converted the blinker01 .elf using

arm-none-eabi-objcopy --srec-forceS3 notmain.elf -O srec notmain.srec

• Started minicom

minicom -b 115200 -D /dev/cu.usbserial-0001

• I got the pi booting prompt and selected Meta-s (send), ascii, selected the file. But I get BADBAD02 back

MESS:00:00:01.977527:0: Failed to open command line file 'cmdline.txt'
MESS:00:00:02.109417:0: brfs: File read: /mfs/sd/kernel.img
MESS:00:00:02.113297:0: Loading 'kernel.img' to 0x8000 size 0x1f851c
MESS:00:00:02.119441:0: gpioman: gpioman_get_pin_num: pin EMMC_ENABLE not defined
MESS:00:00:02.127842:0: uart: Set PL011 baud rate to 103448.300000 Hz
MESS:00:00:02.134292:0: uart: Baud rate change done...
MESS:00:00:02.137727:0: uart: Baud rate change done...
MESS:00:00:02.143145:0: gpioman: gpioman_get_pin_num: pin SDCARD_CONTROL_POWER�������j
                                                                                        002002C4

SREC
BADBAD02

any ideas what could be wrong?
This is the file content I sent

S00F00006E6F746D61696E2E737265631F
S3150000800002D9A0E3050000EBFEFFFFEA001080E5C1
S315000080101EFF2FE1000090E51EFF2FE11EFF2FE15E
S3150000802070402DE964009FE5F9FFFFEB0E16C0E3F3
S31500008030021681E354009FE5F3FFFFEB50609FE5D6
S3150000804050509FE50219A0E30600A0E1EEFFFFEB0A
S315000080500040A0E30400A0E1014084E2EEFFFFEB54
S31500008060010654E3FAFFFF1A0219A0E30500A0E196
S31500008070E5FFFFEB0040A0E30400A0E1014084E23D
S31500008080E5FFFFEB010654E3FAFFFF1AECFFFFEAF8
S3110000809010002020200020202C002020C2
S705000080007A

[philippeflorent]

You did a raw/ascii download of the srec file?

it's a built code that generated the SREC
I notice that the file starts with S so it should engage to state machine of the bootloader
but it is not
regular communication works since my own firmware works as a terminal

but how do you upload the file ? do you reset then upload ? do you wait a bit ?

on ubuntu putty doesn't seem to do anything as I CTRL+V, right click, middle click

I tried this

#!/bin/bash

echo "sending notmain.srec ..." 
stty -F /dev/ttyUSB0 115200
exec 9<>/dev/ttyUSB0
read answer <&9 ; echo "$answer"
read answer <&9 ; echo "$answer"
read answer <&9 ; echo "$answer"
read answer <&9 ; echo "$answer"
cat notmain.srec >&9
exec 9>&-