IFC GPCM with TA

ralftruebenbach — Mon, 02 Nov 2020 13:55:44 GMT

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

Re: IFC GPCM with TA

ufedor — Tue, 06 Dec 2016 16:34:34 GMT

> First of all I think this should be called "32-bit address mode"?

Correct, this is a typo in the RM.

> 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])?

Please refer to the RM descriptions of IFC_GRP_A_BASE and IFC_GRP_B_BASE RCW fields.

Please note that it is reasonable to investigate this issue as a Technical Case:

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IFC GPCM with TA

Re: IFC GPCM with TA