Why does mailbox_client_flash_open() fail after mailbox_client_open() in SDM Bootloader for the Nios® V Processor targeting Agliex™ 7 FPGA? - Why does mailbox_client_flash_open() fail after mailbox_client_open() in SDM Bootloader for the Nios® V Processor targeting Agliex™ 7 FPGA? Description Due to a problem that the Agliex™ 7 FPGA Secure Device Manager (SDM) is busy with FPGA initialization, Nios® V HAL function mailbox_client_flash_open() may fail to open flash after mailbox_client_open() when running SDM Bootloader. Resolution To work around this problem in Agliex™ 7 FPGA Secure Device Manager, add a delayed attempt after function mailbox_client_flash_open() to open flash in the main function in <Project Location>\top_project\sw\mailbox_bootloader\app\mailbox_bootloader.c . The max attempts shown below are 1000, and each attempt is delayed by 10 milliseconds. attribute_((noreturn)) int main(int argc, char **argv){ intel_mailbox_client* mbox_client = mailbox_client_open(MBOX_NAME); int record_address_ptr = PAYLOAD_OFFSET; // Obtain exclusive flash access int attempt = 0; int MAX_ATTEMPTS = 1000; while((mailbox_client_flash_open(mbox_client)!=0) &&(++attempt < MAX_ATTEMPTS)){ usleep(10000); if (attempt == MAX_ATTEMPTS) error(); ...... Custom Fields values: ['novalue'] Troubleshooting 15014993238 False ['IP Examples'] ['FPGA Dev Tools Quartus® Prime Software'] 24.2 23.4 ['Agilex™ 7 FPGAs and SoCs'] ['Embedded Dev Tools SoC Suite'] ['novalue'] ['novalue']