arch/risc-v: Clear BSS section for RISC-V-based Espressif SoCs

[tmedicci]

Summary

• arch/risc-v: Clear BSS section for RISC-V-based Espressif SoCs
  • Always clear the BSS section before calling bootloader_init. This is necessary because, otherwise, bootloader_init may fail even before bootloader_clear_bss_section is called again by that function.

Impact

Impact on user: No.

Impact on build: No.

Impact on hardware: No.

Impact on documentation: No.

Impact on security: No.

Impact on compatibility: No.

Testing

There is no specific test for it. It is just an improvement to ensure the firmware boots up. ostest can be used to test it.

Building

make -j distclean
./tools/configure.sh -S esp32p4-function-ev-board:ostest
make flash ESPTOOL_PORT=/dev/ttyACM0
picocom -b 115200 /dev/ttyUSB1

Running

Just run ostest.

Results

nsh> ostest
stdio_test: write fd=1
stdio_test: Standard I/O Check: printf
stdio_test: write fd=2
...
Final memory usage:
VARIABLE  BEFORE   AFTER
======== ======== ========
arena       769a0    769a0
ordblks         2        5
mxordblk    72620    6dd10
uordblks     4328     43b8
fordblks    72678    725e8
user_main: Exiting
ostest_main: Exiting with status 0
nsh>