LP-AM243: 关于SBL的签名问题

量产时用实际的MPK，请看下面网站上的说明。

Signing the SBL

If the SDK is supposed to be used with a production/development device with actual customer MPKs burnt into the device, please replace the file at ${SDK_INSTALL_PATH}/tools/boot/signing/custMpk_${SOC}.pem.

https://software-dl.ti.com/mcu-plus-sdk/esd/AM243X/latest/exports/docs/api_guide_am243x/SECURE_BOOT.html

您的意思是，调试的时候使用默认的KEY签名，即如下：

ifeq ($(OS),Windows_NT)
  BOOTIMAGE_CERT_GEN_CMD=powershell -executionpolicy unrestricted -command $(MCU_PLUS_SDK_PATH)/tools/boot/signing/x509CertificateGen.ps1
else
  BOOTIMAGE_CERT_GEN_CMD=$(MCU_PLUS_SDK_PATH)/tools/boot/signing/x509CertificateGen.sh
endif

而实际用到产品上时，需要改为Mpk,即