[E3-hacking] PBL & running arbitrary code

Ralph Corderoy e3-hacking@earth.li
Fri, 11 Mar 2005 23:00:58 +0000


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Hi David,

> But the most I'm seeing from the E2 is the occasional 00 byte. What my
> program is doing is sending 0x1B bytes at 9600 8N1, ten times a
> second, and echoing in hex anything that comes back. I run this and
> power cycle the E2. What I should be seeing, if I'm understanding how
> things work, is the E2 respond with 0B 0B 0B... and the boot process
> should halt.

That's basically right.  It sends 15 ASCII ACKs, 0x06 not 0x0b, on
spotting an ESC.

    0338  eb001b44  bl rx_uart0_byte
    033c  e350001b  cmp r0, #&1b               
    0340  1a000003  bne &0354
    0344  e3a04000  mov r4, #0                 # r4 = 0
    0348  e28f0f38  adr r0, ascii_ack_char_x_15 # 0x430, * = 0x6060606
    034c  eb001b4b  bl tx_uart0_string

> I enclose the program, in case anyone can spot any stupid mistakes ---
> serial port programming in Linux is not my forte.

You could use tcgetattr(), followed by bit-twiddling, and then the
tcsetattr() rather than pass lots of 0-bits in.  Can't see anything
other than that.

Attached is a small tar file, exp-1.tar.bz2, containing exp.c and
various other gubbins.  I've heard it has some effect with the E3 doing
what you state above.

> How long does it wait at boot time to be prodded?

Good question.

Cheers,


Ralph.


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