--- mark mark@xenon-computing.com wrote:
Mark Underwood wrote:
--- Jonathan McDowell noodles@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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