Introduction
This datasheet provides the performance numbers of various device drivers in MCU PLUS SDK for AM62PX
Generic Setup details
| SOC Details | Values |
| Core | R5F |
| Core Operating Speed | 800 MHz |
| Cache Status | Enabled |
| Optimization Details | Values |
| Build Profile | Release |
| R5F Compiler flags | -mcpu=cortex-r5 -mfloat-abi=hard -mfpu=vfpv3-d16 -Wall -Werror -g -mthumb -Wno-gnu-variable-sized-type-not-at-end -Wno-unused-function |
| R5F Linker flags | -Wl,–diag_suppress=10063 -Wl,–ram_model -Wl,–reread_libs |
| Code Placement | HSM RAM (For SBL Stage1), DDR (SBL Stage2 and others) |
| Data Placement | HSM RAM (For SBL Stage1), DDR (SBL Stage2 and others) |
Performance Numbers
SBL OSPI NOR performance (HS-FS)
- Software/Application used : sbl_emmc_linux_multistage, ipc_rpmsg_echo_linux, linux and HSM App Images
- Cores booted by stage1 SBL : wkup-r5f0-0
- Cores booted by stage2 SBL : hsm-m4f0-0 mcu-r5f0-0 a530-0
- Size of images loaded by stage1 : 195 KB
- Size of images loaded by stage2 : 908 KB
- Boot Media Clock : 166.667 MHz
- Mode : PHY enabled, DMA enabled
- Protocol : 8D-8D-8D
| SBL Stage1 boot time breakdown | Time (ms) |
| SBL Stage1: System_init | 38.266 |
| SBL Stage1: App_waitForMcuPbist | 0.002 |
| SBL Stage1: Board_init | 0.000 |
| SBL Stage1: Drivers_open | 0.090 |
| SBL Stage1: SBL Drivers_open | 0.133 |
| SBL Stage1: Board_driversOpen | 0.009 |
| SBL Stage1: SBL Board_driversOpen | 1.281 |
| SBL Stage1: App_loadSelfcoreImage | 4.212 |
| -------------------------------------— | -----------— |
| SBL Stage1: Total time taken | 43.997 |
| SBL Stage2 boot time breakdown | Time (ms) |
| SBL Stage2: System_init | 2.157 |
| SBL Stage2: Board_init | 0.003 |
| SBL Stage2: FreeRtosTask Create | 0.257 |
| SBL Stage2: SBL Drivers_open | 1.002 |
| SBL Stage2: SBL Board_driversOpen | 0.132 |
| SBL Stage2: App_loadImages | 3.691 |
| SBL Stage2: App_loadMCUImages | 6.550 |
| SBL Stage2: App_loadLinuxImages | 19.0098 |
| -------------------------------------— | -----------— |
| SBL Stage2: Total time taken | 32.894 |
- Here the CPU load or section copy takes place from the OSPI memory to DDR, this would be slower that mem to mem copy.
- The time taken for Sciclient Get Version can be avoided if the version check is disabled
- Out of the ~38 ms taken for System Init is mostly attributed to DDR initialization.
SBL EMMC performance (HS-FS)
- Software/Application used : sbl_emmc_linux_multistage, ipc_rpmsg_echo_linux, linux and HSM App Images
- Cores booted by stage1 SBL : wkup-r5f0-0
- Cores booted by stage2 SBL : hsm-m4f0-0 mcu-r5f0-0 a530-0
- Size of images loaded by stage1 : 168 KB
- Size of images loaded by stage2 : 908 KB
- Boot Media Clock : 200.00 MHz
- Mode : HS400
| SBL Stage1 boot time breakdown | Time (ms) |
| SBL Stage1: System_init | 38.098 |
| SBL Stage1: Board_init | 0.000 |
| SBL Stage1: Drivers_open | 0.000 |
| SBL Stage1: SBL Drivers_open | 20.432 |
| SBL Stage1: Board_driversOpen | 0.000 |
| SBL Stage1: App_loadSelfcoreImage | 8.567 |
| -------------------------------------— | -----------— |
| SBL Stage1: Total time taken | 67.098 |
| SBL Stage2 boot time breakdown | Time (ms) |
| SBL Stage2: System_init | 2.066 |
| SBL Stage2: Board_init | 0.000 |
| SBL Stage2: FreeRtosTask Create | 0.258 |
| SBL Stage2: SBL Drivers_open | 22.945 |
| SBL Stage2: App_loadImages | 5.256 |
| SBL Stage2: App_loadMCUImages | 8.062 |
| SBL Stage2: App_loadLinuxImages | 19.548 |
| -------------------------------------— | -----------— |
| SBL Stage2: Total time taken | 58.138 |
- The emmc driver initialization is done as part of Drivers_open.
- The time taken for Sciclient Get Version can be avoided if the version check is disabled
- Out of the ~38 ms taken for System Init is mostly attributed to DDR initialization.
IPC performance
IPC NOTIFY
- 10000 messages are sent and average one way message latency is measured
| Local Core | Remote Core | Average Message Latency (us) |
| wkup-r5f0-0 | mcu-r5f0-0 | 1.12 |
IPC RPMSG
- 1000 messages are sent and average one way message latency is measured
| Local Core | Remote Core | Message Size | Average Message Latency (us) | Max Latency (us) | Message Count |
| wkup-r5f0-0 | mcu-r5f0-0 | 32 | 14.233 | 15 | 1000 |
| wkup-r5f0-0 | mcu-r5f0-0 | 64 | 20.666 | 21 | 1000 |
| wkup-r5f0-0 | mcu-r5f0-0 | 112 | 30.199 | 31 | 1000 |
EMMC Performance
| Mode | Data size(MiB) | Write speed(MiBps) | Read speed(MiBps) |
| SDR50 | 1 | 9.13 | 44.98 |
| SDR50 | 4 | 25.90 | 45.55 |
| SDR50 | 6 | 41.53 | 45.58 |
| DDR50 | 1 | 69.22 | 82.07 |
| DDR50 | 4 | 70.97 | 83.69 |
| DDR50 | 6 | 52.52 | 83.77 |
| HS200 | 1 | 104.45 | 157.70 |
| HS200 | 4 | 107.78 | 169.40 |
| HS200 | 6 | 110.31 | 169.82 |
| HS400 | 1 | 100.81 | 238.15 |
| HS400 | 4 | 74.93 | 265.60 |
| HS400 | 6 | 89.85 | 264.73 |
OSPI NOR Flash Performance
- Flash protocol: FLASH_CFG_PROTO_8D_8D_8D
- PHY : enabled
- DMA : enabled
| Data size(MiB) | Write speed(MiBps) | Read speed(MiBps) |
| 1 | 0.42 | 283.57 |
| 5 | 0.42 | 284.78 |
| 10 | 0.43 | 284.93 |
| DQS Tuning Algorithm | Tuning Time (ms) |
| Default Tuning Window | 3.39 ms |
| Fast Tuning Window | 1.15 ms |
GPIO latency
GPIO latency is measured by connecting 2 GPIOs externaly and configuring one GPIO as input and the other as output. Then 1 is written to GPIO output and measure the time between writing 1 to GPIO output to rececving the interrupt at GPIO input.
| Core | GPIO In | GPIO Out | Latency (us) |
| mcu-r5f | MCU_GPIO0_15 | MCU_GPIO0_16 | 2 |
1.8.20