Hi JerryChang,
Thanks for your helps.
We are back with some questions on the overall process, we were not able to expand Trusty available memory space. (see more detail below)
You can find detailed and recorded process below, and our tests to validate memory expansion.
Could let us know if we’ve most probably missed something important along the process?
We also wonder how configuration changes are applied to the newly flashed TOS?
Thanks again for your support !
Trusty available RAM expansion
As previously discussed, we want to increase available memory space in Trusty Trusted Application.
After applying the suggested previously discussed modifications, we’ve followed your instructions by
Modifying the carveout.tzdram.size configuration variable
We’ve applied the same changes to the configuration files in both Linux_for_Tegra/bootloader/ and Linux_for_Tegra/bootloader/t184ref/BCT/.
Reflashing the secure-os partition
Trusty memory expansion validation
In order to check the Trusty TA memory expansion, we implemented two TAs, ECHO-SRV and SMALL-ECHO-SRV.
Both them simply collect the big float array data from Client Application (and store them, manipulate them or not) and send them back to CA.
Since the message port size is limited to 4KB, we need to send multiple rounds of data from CA to TA.
The only difference between two TAs is the maximal size of float array that could be stored in the TA.
For ECHO-SRV, the length of wanted array is 64000, for SMALL-ECHO-SRV, it is 20480.
Allocates a float array of size 20480/64000 at bootloading
all_data = (float*)malloc(MAX_SIZE*sizeof(float));
Echoes data from a CA.
We implement one CA named echo-srv-app which could connect the TIPC channel with either ECHO-SRV or SMALL-ECHO-SRV.
It is able to send a big float array with different sizes to TA, we could compare the different results from two TAs.
The CA splits the big float array to small payloads that are able to be sent to TA.
while(size>BLOCK_SIZE*block_nums){
memcpy(msg->data, data+(BLOCK_SIZE*block_nums),BLOCK_SIZE);
/* Send msg to TA */
printf("This is the %d round of sending data with size %d.\n",block_nums++,BLOCK_SIZE);
write(send_srv_fd, msg, msg_size);
read(send_srv_fd, msg, msg_size);
}
You can find attached TAs and CA source code.
CA-echo-sample.zip (14.2 KB)
TA-echo-srv.zip (9.0 KB)
TA-small-echo-srv.zip (9.1 KB)
Float array allocation(by malloc in C) seems work well, as suggested by the bootloader log.
ECHO-srv: 45: Welcome to ECHO Service(for a big float array) !
ECHO-srv: 164: Init echo-srv IPC services!!
ECHO-srv: 57: All Data has been initialized with size: 64000
SAMLL-ECHO-srv: 45: Welcome to SMALL ECHO Service(for a big float array) !
SAMLL-ECHO-srv: 164: Init echo-srv IPC services!!
SAMLL-ECHO-srv: 57: All Data has been initialized with size: 20480
But for ECHO-SRV TA applications (which echoes array with size of 64000), it crashes at reception of very first CA payload.
No matter the size of data that CA sends(e.g. 1000, 2048 or 64000).
For your information, the SMALL-ECHO-SRV TA works well for a float array of smaller size (20480).
For clarification, we’ve recorded the full process below.
In addition, we can find below timed details on the several steps.
Recorded process
The recording is available here.
TOS_Memory_Expanding.mkv (37.0 MB)
Before the recording, the target device(Jetson AGX Xavier) is in Force Recovery Mode, and both TAs have been compiled successfully.
USB Type C and USB Micro B of target device are connected with host computer.
0:00 - 1:12 : config carveout.tzdram.size in bootloader files tegra194-mb1-bct-misc-l4t.cfg and tegra194-mb1-bct-misc-flash.cfg
1:13 - 1:30 : check the flash command and its options (e.g. secure-os partition)
1:38 - 1:39 (not recorded) : flash with only secure-os partition (According to that you have commented before, this step should be flash all partitions but not only secure-os partition, are we right?)
2:00 - 2:30 : ssh connect Xavier Device and compile CA for SMALL-ECHO-SRV
2:40 - 2:50 & 4:55 - 5:10: explain how to switch CA between two TA targets.
2:51 - 4:30 : execute CA and do tests by sending different sizes of data arrays to SMALL-ECHO-SRV.
4:31 - 4:54 : modify the CA target
5:11 - 5:50 : recompile CA and execute it by sending testing data to ECHO-SRV. Note that,
the testing array sent has lenght of only 2048, and Trusy OS crashed after receiving the first payload.
5:51 - end : check the crashed reason