[E3-hacking] Adding write support to pbltool

[Mark Underwood]

--- mark <mark at xenon-computing.com> wrote:

> Mark Underwood wrote:
> > --- Jonathan McDowell <noodles at earth.li> wrote:
> > 
> >> On Sat, Jan 28, 2006 at 01:09:06AM +0000, David Given wrote:
> >>> On Friday 27 January 2006 23:16, Jonathan McDowell wrote:
> >>> [...]
> >>>> I haven't looked at the code, but my notes say NOR flash is at 0x0,
> >>>> SDRAM is at 0x10000000 and SRAM is at 0x20000000.
> >>> That's different from the E2. Do you know if the jump-to opcode works
> >>> on the E2's version of pbl? Because while pblq can write to RAM and
> >>> flash, it can't execute anything.
> >> I believe you can jump to code in SRAM, but not SDRAM. So you'd load
> >> your kernel into SDRAM, load a small piece of setup code into SRAM and
> >> jump to that. It would setup registers as appropriate and jump to the
> >> kernel.
> >>
> >> J.
> > 
> > Thanks for the help. I can now write my program to my RAM (both SRAM & SDRAM) and have read
> back
> > the contents and it match's what I have written :-). I have implemented the exec function so I
> > _should_ now be able to run my own program on my E3. However, I have written a few simple
> assember
> > programs and haven't seen any life from them (no UART output). I have tested the exec code by
> > reading some data from the E3 and then running pbl exec 0x00000000 which starts the unit
> booting,
> > so unless the have changed to byte order of the address that you need to pass to pbl for the
> exec
> > the only thing I can think is wrong is my test program (my ARM assembly is a bit rusty :-( ). 
> >  
> > I have attached both my modifed pbltool and my latest test program. Any pointers would be
> great.
> > If anyone has got some standalone code to run on the E3 please could you send me it so I can
> try
> > it out. 
> >  
> > Mark
> 
> 
> Hi Again,
> 
> Ok,
> 
> I tried to figure out why the output was not 0, 1 or 2 and noticed
> Jasmines email about the mvn so I changed the mvn to mov and now I get
> '0' written out at 115200 baud, cool!
> 
> I also noticed you are running pbl exec 0x00000000 whereas I am running
> ./pbltool exec  0x20010000.
> 
> But it is running.
> 
> Heres the output from writing/execing with pbltool.
> 
> Prodding...
> Handshaking...
> Got 4 of 14 bytes.
> Got 8 of 10 bytes.
> Got 2 of 2 bytes.
> Checksum = 0x9A
> Talking to PBL v4.9 Build 1311
> Got 4 of 4 bytes.
> Checksum = 0x91
> Got 4 of 22 bytes.
> Got 8 of 18 bytes.
> Got 8 of 10 bytes.
> Got 2 of 2 bytes.
> Checksum = 0x4C
> 0 0x00000000 0x00020000 0x00000000 0x00020000 0x001F 0x0087
> Got 4 of 22 bytes.
> Got 8 of 18 bytes.
> Got 8 of 10 bytes.
> Got 2 of 2 bytes.
> Checksum = 0x23
> 1 0x00400000 0x01B40000 0x00000000 0x00000000 0x007F 0x9875
> bash-3.1$ ./pbltool write 0x20010000 dummy
> 
> Got 4 of 14 bytes.
> Got 8 of 10 bytes.
> Got 2 of 2 bytes.
> Checksum = 0x9A
> Talking to PBL v4.9 Build 1311
> Entering writeblock
> Got 4 of 4 bytes.
> Checksum = 0xDB
> sendpacket: 0 424 bytes transfered so far (0 KB)
> bash-3.1$ ./pbltool exec  0x20010000
> Got 4 of 14 bytes.
> Got 8 of 10 bytes.
> Got 2 of 2 bytes.
> Checksum = 0x9A
> Talking to PBL v4.9 Build 1311
> Got 2 of 2 bytes.
> Checksum = 0x86
> 
> 
> And heres the reply from the E3
> 
> Connecting to /dev/ttyS0, speed 115200
>  Escape character: Ctrl-\ (ASCII 28, FS): enabled
> Type the escape character followed by C to get back,
> or followed by ? to see other options.
> ----------------------------------------------------
> 0000000000000000000000000000000000000000000000000000
> 0000000000000000000000000000000000000000000000000000
> 0000000000000000000000000000000000000000000000000000
> 0000000000000000000000000000000000000000000000000000
> 0000000000000000000000000000000000000000000000000000
> 0000000000000000000000000000000000000000000000000000
> 0000000000000000000000000000000000000000000000000000
> 0000000000000000000000000000000000000000000000000000
> 0000000000000000000000000000000000000000000000000000
> 0000000000000000000000000000000000000000000000000000
> 0000000000000000000000000000000000000000000000000000
> 0000000000000000000000000000000000000000000000000000
> 0000000000000000000000000000000000000000000000000000
> 0000000000000000000000000000000000000000000000000000
> ----------------------------------------------------
> (/mnt/usr3/src/ckermit/) C-Kermit>
> 
> 
> 
> 
> Regards, Mark.
> 
> 

That's great, I have modified my assembler program and compiled it as you did and now I have an E3
sending '0' to me :-D. I have a 2.6 kernel and rootfs ready to test and am uploading now (I think
I need to add the command to change baud rate as upoading a 1.2 MB file at 9600 takes a while!). 
 
B.T.W Once I have fully tested my modifications to pbltool is there a place that I can put it (CVS
ideally) as I don't currently have a website :-(. 
 
Mark

> 
> 
> 
> 
> 
> 
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