On 29-09-16 16:22, Nathan Rossi wrote:
On Thu, Sep 29, 2016 at 7:46 PM, Mike Looijmans <[email protected]> wrote:
On 28-09-16 17:20, Nathan Rossi wrote:
On Wed, Sep 28, 2016 at 10:50 AM, Manjukumar Harthikote Matha
<[email protected]> wrote:
Hi Mike,
<.....>
LD[unexport] = "1"
+ZYNQMP_ATF_MEM_BASE = "0xfffe5000"
+ZYNQMP_ATF_MEM_SIZE = "0x16000"
Maybe reading the load address from elf might help. I think MEM_BASE
address might change going forward.
For example:
https://github.com/Xilinx/arm-trusted-firmware/commit/eb4fa652d424b895
7a927c6137e2ae3652b0b1bb
This patch was to accommodate that. The current version will load it at
the wrong
location.
I am looking to see if we can read from the generated elf and populate
the MEM_BASE and MEM_SIZE
With the current patch, I think it will be maintenance burden every
release, trying to mitigate it if possible.
The generated bl31.elf is populated with the correct entry point address:
Entry point address: 0xfffe5000
Which is pointing to bl31_entrypoint,
https://github.com/Xilinx/arm-trusted-firmware/blob/eb4fa652d424b8957a927c6137e2ae3652b0b1bb/bl31/bl31.ld.S#L35
Which could be used as an alternate source of the address:
625: 00000000fffe5000 212 FUNC GLOBAL DEFAULT 1
bl31_entrypoint
My only query is whether the ZYNQ_ATF_MEM_* variables make sense as
overrides? Essentially if there is a potential use case when bl31
needs to be built to execute in an older/newer environment that
differs from the default values (of the current version used)?
What I really wanted is the opposite, get the address from the binary. That
would solve the "magic number" that you have to put in the recipe. I
couldn't find a way to do that, so I did the opposite, make sure that both
code and recipe share the same magic number.
I had no intention of making this "configurable" or so, I just wanted it
consistent.
That makes it simpler then :). I have a sent a patch that does the
dynamic reading from the elf to solve this. If you could please give
it a test and let me know that it works as you expect.
Looks fine, and a lot better than what I came up with. Probably won't be able
to test today though.
M.
Kind regards,
Mike Looijmans
System Expert
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