hardware: usrp-e110 (gumstix overo) , omap3530, GPMC CS5 used by ethernet, CS4 used by FPGA
software: ubuntu, the FPGA GPMC driver provide by ETTUS. and during kernerl init file : board_overo.c , it setup these params into GPMC config:
// Set up CS4, data read/write
gpmc_cs_write_reg(4, GPMC_CS_CONFIG7, 0x0); udelay(100);
// Signal control parameters per chip select
tmp = gpmc_cs_read_reg(4, GPMC_CS_CONFIG1);
tmp |= (GPMC_CONFIG1_WRITETYPE_SYNC);
tmp |= (GPMC_CONFIG1_READTYPE_SYNC); tmp |= (GPMC_CONFIG1_FCLK_DIV(2));
gpmc_cs_write_reg(4, GPMC_CS_CONFIG1, tmp);
printk("GPMC_CONFIG1 reg: %x\n", tmp); #endif
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about config7 , it setup to 0x0, that mings forbidden the CS4 ??
during my work , under the file system /dev/, there has the usrp_e module ( FPGA interface module ). And it can opened in the application. And the ethernet can always work . when I snaped the signal by FPGA chipscope , I found the CS5 sometimes low , sometimes high , but the CS4 always keep high.
when I modified the board_overo.c , setup the congfig7 to 0xf60, I found it will be error when kernel booting .
So, my question is how ethernet and FPGA can work at sametime ? and how can I write the application ?
Thanks!!!!!!!
