Hello,
we have a T2081 board with a FPGA connected via IFC_CS2_B (normal GPCM mode). The read and write accesses should be terminated by the FPGA via transfer acknowledge signal. Unluckily every access to/from the FPGA hangs and is never terminated. I can see that the CPU begins the access by asserting CS and OE. The FPGA answers by asserting the TA signal but CPU never deasserts CS/OE. Also the timeout (IFC_CSOR2_GPCM[GPTO]) does not end the access.
=> md ffd00000
ffd00000:
(CPU HANGS)
IFC_CS2_B=dark blue IFC_OE_B=light blue IFC_RB0_B(TA)=pink
/* DDU */
#define DDU_BASE 0xffd00000
#define DDU_BASE_PHYS (0xf00000000ull | DDU_BASE)
#define CONFIG_SYS_CSPR2_EXT (0xf)
#define CONFIG_SYS_CSPR2 (CSPR_PHYS_ADDR(DDU_BASE_PHYS) \
| CSPR_PORT_SIZE_16 \
| CSPR_MSEL_GPCM \
| CSPR_V)
#define CONFIG_SYS_AMASK2 IFC_AMASK(1*1024*1024)
#define CONFIG_SYS_CSOR2 (CSOR_GPCM_GPTO(128*1024) \
| CSOR_GPCM_RGETA_EXT | CSOR_GPCM_WGETA_EXT | CSOR_GPCM_BCTLD)
/* DDU Timing parameters for IFC CS2 */
#define CONFIG_SYS_CS2_FTIM0 (FTIM0_GPCM_TACSE(0x1) | \
FTIM0_GPCM_TEADC(0x02) | \
FTIM0_GPCM_TEAHC(0x01))
#define CONFIG_SYS_CS2_FTIM1 (FTIM1_GPCM_TACO(0x1) | \
FTIM1_GPCM_TRAD(0x1))
#define CONFIG_SYS_CS2_FTIM2 (FTIM2_GPCM_TCS(0x1) | \
FTIM2_GPCM_TCH(0x1) | \
FTIM2_GPCM_TWP(0x1))
#define CONFIG_SYS_CS2_FTIM3 0x1
I'm a little bit confused about figure 13-4 "Internal connectivity of RB signal for 28-bit address mode" in T2080RM (02/2016). First of all I think this should be called "32-bit address mode"?
I'm also a little bit unsure how to set the address mode. Does this refer to the NOR Flash strapping options (cfg_rcw_src[6:7])?
So setting cfg_rcw_src[6:7]=11 means that I have to use IFC_RB0 as acknowledge pin for every chip select (except CS1), right?
Original Attachment has been moved to: ifc_debug_details.txt.zip
