FAQ_MA35D1 SD1 eMMC 4Bit Failed to Start

[yhcheng3]

Question :

SD1 eMMC 4Bit Failed to Start


Answer.


Buildroot:

1. Enter the following path and modify the TF-A code
   
   Modify ma35d1_common.c (~/MA35D1_Buildroot/output/build/arm-trusted-firmware-custom/plat/nuvoton/ma35d1)

   Code: Select all

   vi ma35d1_common.c

   And change as follows :
   

   Code: Select all

   static void ma35d1_sdhc_setup(struct mmc *mmc)
   {
          int node;
   
   	// ma35d1_sdhc_hw_init(mmc);  // <<<<<<<<<<<<<<<<<<<<<<<< Move this code to below  >>
                                                                                                                                                                 
          /* get device tree information */                                                                                              
          if (fdt_check_header(fdt) < 0) {                                                                                                 
                 WARN("device tree header check error.\n");                                                                    
          }                                                                                                                                                      
                                                                                                                                                                 
                                                                                                                                                                 
   …                                                                                                                                                           
         mmc->offset = fdt_read_uint32_default(fdt, node, "mmc-image-offset", 0);                      
         mmc->bus_width = fdt_read_uint32_default(fdt, node, "bus-width", 1);                              
                                                                                                                                                                 
         ma35d1_sdhc_hw_init(mmc);       //   <<<<<<<<<<<<<<<<<<<<<    move code here  >>>>>>>>>
   …
   
   

2. Rebuild TF-A code

   Code: Select all

   ~/Buildroot_MA35D1$ make arm-trusted-firmware-rebuild

3. Repack Image

   Code: Select all

   ~/Buildroot_MA35D1$ make

4. Burn Image to MA35D1 board

#MA35D1 #SD1 #eMMC #boot
.