AM5716: gpmc 接口的访问时cs3未有输出。

AM5716与fpga通过gpmc接口连接。内核打印信息看gpmc正常初始化，实际访问接口时只有地址有输出，cs和其他读写控制信号未有变化。

[ 2.244863] devices_kset: Moving 50000000.gpmc to end of list
[ 2.244872] platform 50000000.gpmc: Retrying from deferred list
[ 2.244894] bus: 'platform': driver_probe_device: matched device 50000000.gpmc with driver omap-gpmc
[ 2.244901] bus: 'platform': really_probe: probing driver omap-gpmc with device 50000000.gpmc
[ 2.245050] omap-gpmc 50000000.gpmc: no init pinctrl state
[ 2.245079] omap-gpmc 50000000.gpmc: no idle pinctrl state
[ 2.245253] omap-gpmc 50000000.gpmc: GPMC revision 6.0
[ 2.250420] gpmc_mem_init: disabling cs 0 mapped at 0x0-0x1000000
[ 2.256722] gpio gpiochip8: (omap-gpmc): added GPIO chardev (254:8)
[ 2.256801] gpiochip_setup_dev: registered GPIOs 510 to 511 on device: gpiochip8 (omap-gpmc)
[ 2.256990] gpmc cs3 before gpmc_cs_program_settings:
[ 2.287258] gpmc cs3 access configuration:
[ 2.291371] gpmc,mux-add-data = <2>;
[ 2.294960] gpmc,device-width = <2>;
[ 2.298548] gpmc,wait-pin = <0>;
[ 2.301789] gpmc,burst-length = <4>;
[ 2.305381] gpmc,cycle2cycle-samecsen = <1>;
[ 2.323410] gpmc cs3 timings configuration:
[ 2.333096] gpmc,cs-on-ns = <0>; /* 0 ns – 0 ns; 0 ticks */
[ 2.342264] gpmc,cs-rd-off-ns = <60>; /* 57 ns – 60 ns; 16 ticks */
[ 2.348559] gpmc,cs-wr-off-ns = <60>; /* 57 ns – 60 ns; 16 ticks */
[ 2.354867] gpmc,adv-on-ns = <3>; /* 1 ns – 3 ns; 1 ticks */
[ 2.360550] gpmc,adv-rd-off-ns = <11>; /* 8 ns – 11 ns; 3 ticks */
[ 2.366766] gpmc,adv-wr-off-ns = <11>; /* 8 ns – 11 ns; 3 ticks */
[ 2.372973] gpmc,adv-aad-mux-on-ns = <0>; /* 0 ns – 0 ns; 0 ticks */
[ 2.379354] gpmc,adv-aad-mux-rd-off-ns = <0>; /* 0 ns – 0 ns; 0 ticks */
[ 2.386084] gpmc,adv-aad-mux-wr-off-ns = <0>; /* 0 ns – 0 ns; 0 ticks */
[ 2.392814] gpmc,oe-on-ns = <15>; /* 12 ns – 15 ns; 4 ticks */
[ 2.398672] gpmc,oe-off-ns = <60>; /* 57 ns – 60 ns; 16 ticks */
[ 2.404703] gpmc,oe-aad-mux-on-ns = <0>; /* 0 ns – 0 ns; 0 ticks */
[ 2.410995] gpmc,oe-aad-mux-off-ns = <0>; /* 0 ns – 0 ns; 0 ticks */
[ 2.417376] gpmc,we-on-ns = <15>; /* 12 ns – 15 ns; 4 ticks */
[ 2.423232] gpmc,we-off-ns = <60>; /* 57 ns – 60 ns; 16 ticks */
[ 2.429264] gpmc,rd-cycle-ns = <60>; /* 57 ns – 60 ns; 16 ticks */
[ 2.435471] gpmc,wr-cycle-ns = <60>; /* 57 ns – 60 ns; 16 ticks */
[ 2.441676] gpmc,access-ns = <45>; /* 42 ns – 45 ns; 12 ticks */
[ 2.447707] gpmc,page-burst-access-ns = <0>; /* 0 ns – 0 ns; 0 ticks */
[ 2.454349] gpmc,bus-turnaround-ns = <0>; /* 0 ns – 0 ns; 0 ticks */
[ 2.460729] gpmc,cycle2cycle-delay-ns = <7>; /* 4 ns – 7 ns; 2 ticks */
[ 2.467371] gpmc,wait-monitoring-ns = <0>; /* 0 ns – 0 ns; 0 ticks */
[ 2.473838] gpmc,clk-activation-ns = <0>; /* 0 ns – 0 ns; 0 ticks */
[ 2.480217] gpmc,wr-data-mux-bus-ns = <26>; /* 23 ns – 26 ns; 7 ticks */
[ 2.486947] gpmc,wr-access-ns = <30>; /* 27 ns – 30 ns; 8 ticks */
[ 2.685761] gpmc cs3 after gpmc_cs_set_timings:
[ 2.715498] gpmc cs3 access configuration:
[ 2.719609] gpmc,mux-add-data = <2>;
[ 2.723195] gpmc,device-width = <2>;
[ 2.726783] gpmc,wait-pin = <0>;
[ 2.730022] gpmc,burst-length = <4>;
[ 2.733610] gpmc,cycle2cycle-samecsen = <1>;
[ 2.737895] gpmc cs3 timings configuration:
[ 2.742094] gpmc,cs-on-ns = <3>; /* 1 ns – 3 ns; 1 ticks */
[ 2.747689] gpmc,cs-rd-off-ns = <112>; /* 110 ns – 112 ns; 30 ticks */
[ 2.754246] gpmc,cs-wr-off-ns = <112>; /* 110 ns – 112 ns; 30 ticks */
[ 2.760801] gpmc,adv-on-ns = <11>; /* 8 ns – 11 ns; 3 ticks */
[ 2.766658] gpmc,adv-rd-off-ns = <52>; /* 49 ns – 52 ns; 14 ticks */
[ 2.773038] gpmc,adv-wr-off-ns = <52>; /* 49 ns – 52 ns; 14 ticks */
[ 2.779418] gpmc,adv-aad-mux-on-ns = <0>; /* 0 ns – 0 ns; 0 ticks */
[ 2.785798] gpmc,adv-aad-mux-rd-off-ns = <0>; /* 0 ns – 0 ns; 0 ticks */
[ 2.792527] gpmc,adv-aad-mux-wr-off-ns = <0>; /* 0 ns – 0 ns; 0 ticks */
[ 2.799257] gpmc,oe-on-ns = <52>; /* 49 ns – 52 ns; 14 ticks */
[ 2.805202] gpmc,oe-off-ns = <112>; /* 110 ns – 112 ns; 30 ticks */
[ 2.811495] gpmc,oe-aad-mux-on-ns = <0>; /* 0 ns – 0 ns; 0 ticks */
[ 2.817786] gpmc,oe-aad-mux-off-ns = <0>; /* 0 ns – 0 ns; 0 ticks */
[ 2.824167] gpmc,we-on-ns = <52>; /* 49 ns – 52 ns; 14 ticks */
[ 2.830111] gpmc,we-off-ns = <112>; /* 110 ns – 112 ns; 30 ticks */
[ 2.836405] gpmc,rd-cycle-ns = <112>; /* 110 ns – 112 ns; 30 ticks */
[ 2.842873] gpmc,wr-cycle-ns = <112>; /* 110 ns – 112 ns; 30 ticks */
[ 2.849340] gpmc,access-ns = <82>; /* 79 ns – 82 ns; 22 ticks */
[ 2.855372] gpmc,page-burst-access-ns = <11>; /* 8 ns – 11 ns; 3 ticks */
[ 2.862187] gpmc,bus-turnaround-ns = <0>; /* 0 ns – 0 ns; 0 ticks */
[ 2.868568] gpmc,cycle2cycle-delay-ns = <30>; /* 27 ns – 30 ns; 8 ticks */
[ 2.875472] gpmc,wait-monitoring-ns = <0>; /* 0 ns – 0 ns; 0 ticks */
[ 2.881938] gpmc,clk-activation-ns = <0>; /* 0 ns – 0 ns; 0 ticks */
[ 2.888318] gpmc,wr-data-mux-bus-ns = <52>; /* 49 ns – 52 ns; 14 ticks */
[ 2.895134] gpmc,wr-access-ns = <90>; /* 87 ns – 90 ns; 24 ticks */
[ 2.901820] driver: 'omap-gpmc': driver_bound: bound to device '50000000.gpmc'
[ 2.901847] bus: 'platform': really_probe: bound device 50000000.gpmc to driver omap-gpmc

为调试方便直接通过uboot调试gpmc接口，配置cs3相关寄存器，通过md命令参看gpmc配置如下

=>md 0x500000f0

500000f0: 00001200 00101000 00030301 10041004 …………….
50000100: 000c1010 08070280 00000f48 00870086 ……..H…….
50000110: 00890088 008b008a 00000000 00000000 …………….
50000120: 00001000 00101001 22060514 10057016 ………..".p..
50000130: 010f1111 8f070000 00000f00 00000000 …………….
50000140: 00000000 00000000 00000000 00000000 …………….

访问gpmc基地址，得到值为发送地址的值，cs3未有输出。

=> md.w 0x08000000  
08000000: 0000 0001 0002 0003 0004 0005 0006 0007 …………….
08000010: 0008 0009 000a 000b 000c 000d 000e 000f …………….

管脚配置为模式0：

=> md 0x4A0034BC
4a0034bc: 00060000 00040000 00040000 00060000 …………….
4a0034cc: 00060000 00040000 0001000e 000e0000 …………….

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Shine：

请问是自己的板子还是EVM板？processor SDK是哪个版本？

有用示波器量过管脚时序吗？

,

eazy lee：

我的sdk是ti-processor-sdk-linux-rt-am57xx-evm-06.03.00.106-Linux-x86-Install.bin 

用示波器量过的，也用fpga抓过信号，只看到了地址有变化，cs、we等其他控制信号没有输出变化值。

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Arabic
Hebrew
Polish

Bulgarian
Hindi
Portuguese

Catalan
Hmong Daw
Romanian

Chinese Simplified
Hungarian
Russian

Chinese Traditional
Indonesian
Slovak

Czech
Italian
Slovenian

Danish
Japanese
Spanish

Dutch
Klingon
Swedish

English
Korean
Thai

Estonian
Latvian
Turkish

Finnish
Lithuanian
Ukrainian

French
Malay
Urdu

German
Maltese
Vietnamese

Greek
Norwegian
Welsh

Haitian Creole
Persian

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Shine：

我把您的问题升级给英文e2e的工程师，请关注下面帖子的回复，谢谢！https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1090390/am5716-no-cs-we-control-signals-output-from-gpmc

,

Shine：

请下面e2e工程师的回复

Can you try with the following settings in CTRL_CORE_PAD registers.

CTRL_CORE_PAD_GPMC_CS0 = 0x00060000;

CTRL_CORE_PAD_GPMC_CLK = 0x00060000;

It also doesn't seem like the GPMC_CONFIG registers are set properly.  Has customer checked through the TRM to update the values based on their use-case? 

For reference, GPMC_CONFIG1[1:0] controls the clock divider from GPMC_FCLK (L3MAIN1_L3_GICLK), which is normally at 266 MHz.  At a value of 0x0, this means GPMC_CLK is using 266 MHz directly, which seems too high.