To the lin...@li..., mj...@al... wrote:
> We seem to be having a run of bad luck with our Hitachi 7750
> board, and we're wondering if anyone else can give us some
> tips.
I've changed the forum to lin...@m1..., where I think the
topic is relevant.
> First, we are able to upload S-records from Windows
> Hyperterminal to the board just fine, but we're unable
> to upload even the smallest programs using Minicom or
> "cat" or the mouse from Linux. The symptoms are that
> the board starts spitting a message saying
> "Error: InDev0Buff was full.". Any ideas?
I believe that the error is from the ROM monitor. As there's
no flow control feature, the buffer is overflowed.
You need ****PAUSE**** here, as there's no flow control.
> Second, we would like to try Niibe-san's gdb stub. But
> we are unable to get the "fl" command to write to the
> flash memory.
>
> We type "fl", the flash image gets moved to RAM, we upload
> the S-records for a short program, the flash gets programmed,
> but when we do a "md 01000000" to see the flash, it's still
> all 0xff. Any ideas?
>
> Any help would be most appreciated.
You need to specify ***OFFSET*** to the fl command here.
---------------------- Excerpt from the article I posted:
In my case, I have to set MD[2:0] ON-OFF-OFF and specify the clock
rate 6:2:1 (CPU 200MHz, Bus 66MHz, Module 33MHz), to stabilize it.
In case of Busclock=33MHz, I faced sudden stop/reset of the system, as
I've reported. I don't know why.
Currently, it works fine for me.
To write gdb-stub image to the flash rom, I used Kermit like follows.
---------------------- Kermit
> set line /dev/ttyS0
> set speed 115200
> binary
> set transmit pause 1
---------------------- On the monitor (FLash command)
Ready> fl a0000000
---------------------- Kermit to send gdb-stub S-record
> transmit gdb-sh-stub/sh-stub.srec
----------------------
You need some "pause" as there's no protocol to control the flow.
But I don't recommend so much using GDB stub, as it's not good, no
user interface. If you'd like hacking, please try it out.
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