LS1043A communicate with an on-board FPGA

[Yangjk]

Hello,

We have a custom LS1043A board. We want to use IFC to communicate with an extern FPGA .

I want to write data to extern FPGA, I see the code in uboot/board/freescale/ls1043ardb/cpld.c :

void cpld_write(unsigned int reg, u8 value)

{

    void *p = (void *)CFG_SYS_CPLD_BASE;

    out_8(p + reg, value);

}

I search this macro " CFG_SYS_CPLD_BASE " in the uboot project, is :

#define CFG_SYS_CPLD_BASE       0x7fb00000

My understand to this address is the internal sram address which mapped to extern FPGA.

Now, I use the extern FPGA as a extern ram, if I want to Write data to address 0 of this

"ram" ,  do I need to do some initialization before write?

[yipingwang]

Please refer to "Table 2-1. System memory map" in LS1043ARM, this address is IFC region, no need initialization to write this memory.

[Yangjk]

Thanks for your answer, my understand to your answer is :

If I want to write 1 to address 0x0f of extern FPGA, I only need to write one line of code :

out_8(0x7fb00000 + 0x0f, 0x01);

this data "0x01" will be written in the address 0x0f of extern FPGA, any other initialization work (such as internal sram init in IFC nand flash) we do not need to do in driver