[U-Boot-Users] U-Boot on MPC8280
wd at denx.de
Wed Jan 7 15:41:27 CET 2004
in message <37FB7AA6F5F9814FB634A7BF4C35A6F501213D91 at ESEALNT442.al.sw.ericsson.se> you wrote:
> Do you think that the Windriver equipment ( e.g. VisionPROBE ) is of low quality?
First of all I have to point out that I don't have any first-hand
experience with the Vision* tools. My statement is based on the
collected reports of users of these tools for PPCBoot, U-Boot, and
If you search the mailing list you will find many reports from people
who ran into problems using the Vision* tools. With U-Boot there are
two typical problems: getting the images loaded on the target system,
and debugging after relocation to RAM.
I don't think it is low quality. Actually I think the tools are high
quality, but they are somewhat limited in operation.
> When looking at the demos, they have been looking a bit sharper
> than e.g. the BDI2000.
The main difference is that the BDI2000 is just a debug interface,
and the quality of the total system depends on the quality of the
debugger frontend. If you are used to working with GDB / DDD /
Insight etc. this is all you need.
The Vision* tools provide a complex solution, with some restrictions
(please correct me if I'm wrong):
* The tools seem to have problems understanding and loading certain
image formats; obviously you cannot simply use a binary image to
avoid all interpretation of internal data structures, and the ELF
loader loads only the segments it knows about (which may cause
problems with certain Linux images),
* The tools are limited in the way how they support the MMU. AFAIK
only a static mapping is supported, which is not sufficient to
really debug a system like Linux where you have to deal with
dynamic page tables, dynamically loaded device drivers and modules
Maybe the BDI2000 is not as fancy to use, but at least it does a
solid job in these areas, and simply works.
Other things to keep in mind:
* I have been told that the price for the Linux version of the tools
is significantly higher (2 x ?) than the windoze version. The
BDI2000 in contrast is not only cheaper, but also OS independend:
it will run on any system where you find a GDB.
* Note that you can buy firmware versions of the BDI2000 for most
well-known debuggers, which might give you the same "sharp look" as
Vision* - but I never used any such tools (because usually they
will cost a lot of $$ and run only under Windoze which I don;t
Hope this helps.
Software Engineering: Embedded and Realtime Systems, Embedded Linux
Phone: (+49)-8142-4596-87 Fax: (+49)-8142-4596-88 Email: wd at denx.de
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