Hello, I am very interested in genode and I am working on tz_vmm demo using i.mx53-qsb board now. After the tz_vmm start, I find a boot message like this: " Genode 18.05 <local changes> 211 MiB RAM and 64535 caps assigned to init "
To my understanding, it's present that the available memory that the genode os in secure world is 211MB. And After the system boot up, I use Top command to observe the memroy that normal world have which gives me like this: " Mem: 37956K used, 49444K free, 0K shrd, 68K buff, 26456K cached "
This shows that the total memory the linux in the normal world can use is less than 150MB. And I have some questions about this: 1. Can this memory size be increased? For example, I want to increase the memory size that genode can use. To my understanding, this memory distribution between two worlds(secure and normal) can be configured. So I wonder whether I can determine this memory distribution. If it's indeed configurable, where I can find the source file to configure this and whether this configuration can be changed dynamically when the system is running. 2. As far as I know, the i.mx53-qsb have 1GB, but from the situation above, the total memory size is about 400MB which is far less than 1GB. So why can this situation happened? Thanks, Best wishes
Hi,
First something off-topic: It seems that you have set "respond-to" to be only your own mail address. If so, could you please refrain from this in the future? At least to me, it seems a bit annoying to have to check the receiver manually each time.
Now to your question:
Its not that much of information but here is what I vaguely remember:
1) Normally, there are certain limitations to RAM partitioning in Trustzone. So you can't choose freely how much of the RAM should be trusted and how much not. I can't tell how the limitations looked like in particular but I remember that it was important to take care of them when configuring.
2) The means of Trustzone configuration are pretty implementer-specific You may want to have a look at [1], [2], and [3] to see how Trustzone-relevant stuff is initialized by base-hw on IMX.
3) There's some documentation about AIPSTZ and CSU in [4], [5].
I hope this helps.
Cheers, Martin
[1] <GENODE_DIR>(repos/base-hw/src/bootstrap/spec/arm/imx_aipstz [2] <GENODE_DIR>(repos/base-hw/src/bootstrap/spec/arm/imx_csu [3] <GENODE_DIR>(repos/base-hw/src/bootstrap/spec/arm/imx_tzic [4] https://www.nxp.com/docs/en/reference-manual/iMX53RM.pdf [5] https://www.nxp.com/docs/en/reference-manual/IMX53RQSBRM-R.pdf
El 21/09/18 a las 15:39, lzSun escribió:
Hello, I am very interested in genode and I am working on tz_vmm demo using i.mx53-qsb board now. After the tz_vmm start, I find a boot message like this: " Genode 18.05 <local changes> 211 MiB RAM and 64535 caps assigned to init " To my understanding, it's present that the available memory that the genode os in secure world is 211MB. And After the system boot up, I use Top command to observe the memroy that normal world have which gives me like this: " Mem: 37956K used, 49444K free, 0K shrd, 68K buff, 26456K cached " This shows that the total memory the linux in the normal world can use is less than 150MB. And I have some questions about this:
- Can this memory size be increased? For example, I want to increase
the memory size that genode can use. To my understanding, this memory distribution between two worlds(secure and normal) can be configured. So I wonder whether I can determine this memory distribution. If it's indeed configurable, where I can find the source file to configure this and whether this configuration can be changed dynamically when the system is running. 2. As far as I know, the i.mx53-qsb have 1GB, but from the situation above, the total memory size is about 400MB which is far less than 1GB. So why can this situation happened? Thanks, Best wishes
-
lzSun -
Martin Stein