Enabling LW H2F bridge from MPL --> hangs

Altera_Forum · ‎04-18-2017

Hi,

I need to enable the LW H2F bridge from HPS in order to access my FPGA logic before loading u-boot.

The MPL runs from the FPGA.

Actually, I managed to make it work, but I don't know why it works :shock:. Please see the code below. This code will hang on the first attempt to access the LW bridge, BUT if I add:

ALT_PRINTF("RSTMGR %08x\n", alt_read_word(SOCFPGA_RSTMGR_ADDRESS));

right after remapping, then the MPL runs fine. I fount this out just by coincident.


board_init()
{
...
...
    sysmgr_pinmux_init();
    releasing_all_peripherals_from_reset();     <--- added by me 
    warm_reset_handshake_support();   <--- added by me
    alt_bridge_init(ALT_BRIDGE_LWH2F, NULL, NULL);   <--- added by me
    alt_write_word(ALT_L3_REMAP_ADDR, 0x18 | 0x1); // remap 0x0 to OCRAM, Maintain FPGA connection  <--- moved from the end of the board_init()
    // thaw (un-freeze) all IO banks
    sys_mgr_frzctrl_thaw_req(FREEZE_CHANNEL_0, FREEZE_CONTROLLER_FSM_SW);
    sys_mgr_frzctrl_thaw_req(FREEZE_CHANNEL_1, FREEZE_CONTROLLER_FSM_SW);
    sys_mgr_frzctrl_thaw_req(FREEZE_CHANNEL_2, FREEZE_CONTROLLER_FSM_SW);
    sys_mgr_frzctrl_thaw_req(FREEZE_CHANNEL_3, FREEZE_CONTROLLER_FSM_SW);

...

}

Thanks in advance!