e923c07ab0
This is addressing an issue raised in the mailing list [1]
where setting up a PCI mem bar for an ethernet device
resulted into an overlap of memory ranges:
fatal: system.iobus has two ports responding within range
[0x80000000:0x80020000]:
system.realview.ethernet.pio
system.iobridge.cpu_side_port
The reason for this is the following:
The PCI mem range in the DTB is using 0x40000000 (3rd word) as a
starting address in the PCI domain, which is linked to 0x40000000 in the
host domain.
<0x02000000 0x0 0x40000000 0x0 0x40000000 0x0 0x40000000>;
However the current mapping scheme works with simple fixed translation
So address 0x40000000 in the PCI domain will be mapped to 0x40000000 +
0x40000000 = 0x80000000, which is where DRAM starts
This is aligning with DTB autogeneration, which is setting up a
PCI mem range starting at PCI address = 0 [2]
[1]: https://www.mail-archive.com/gem5-users@gem5.org/msg18941.html
[2]: https://github.com/gem5/gem5/blob/v20.1.0.0/src/dev/arm/RealView.py#L161
Change-Id: I4538511453cfd5143fb4613a080780dc86b2244c
Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/39915
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Bobby R. Bruce <bbruce@ucdavis.edu>
Maintainer: Bobby R. Bruce <bbruce@ucdavis.edu>
This is the gem5 simulator. The main website can be found at http://www.gem5.org A good starting point is http://www.gem5.org/about, and for more information about building the simulator and getting started please see http://www.gem5.org/documentation and http://www.gem5.org/documentation/learning_gem5/introduction. To build gem5, you will need the following software: g++ or clang, Python (gem5 links in the Python interpreter), SCons, SWIG, zlib, m4, and lastly protobuf if you want trace capture and playback support. Please see http://www.gem5.org/documentation/general_docs/building for more details concerning the minimum versions of the aforementioned tools. Once you have all dependencies resolved, type 'scons build/<ARCH>/gem5.opt' where ARCH is one of ARM, NULL, MIPS, POWER, SPARC, or X86. This will build an optimized version of the gem5 binary (gem5.opt) for the the specified architecture. See http://www.gem5.org/documentation/general_docs/building for more details and options. The basic source release includes these subdirectories: - configs: example simulation configuration scripts - ext: less-common external packages needed to build gem5 - src: source code of the gem5 simulator - system: source for some optional system software for simulated systems - tests: regression tests - util: useful utility programs and files To run full-system simulations, you will need compiled system firmware (console and PALcode for Alpha), kernel binaries and one or more disk images. If you have questions, please send mail to gem5-users@gem5.org Enjoy using gem5 and please share your modifications and extensions.