am3358 change to gpio to enable the ddr3

fly100

hello, the default u-boot use gpio0_7 to enable the ddr3, now my borad use to gpio3_18. So I config the mcasp0_aclkr MODE 7, enable the pin,gpio_request(114,"ddr_vtt_en"); gpio_direction_output(114,1). but int the step gpio_direction_output,the function is blocked, can't return. why? thanks.

over 11 years ago

0 Biser Gatchev-XID over 11 years ago

TI__Guru**** 393215 points

Hi,

I will forward this to the SW team. Please post what Linux version you are using.

0 fly100 over 11 years ago in reply to Biser Gatchev-XID

Intellectual 620 points

thanks. Linux version? no, it is in the u-boot, I am using the u-boot-2011.09-psp04.06.00.08.

0 fly100 over 11 years ago in reply to Biser Gatchev-XID

Intellectual 620 points

in addition, gpio_direction_output function stoped at running the __raw_writel() function. I am puzzled.

0 Ivan Matrakov over 11 years ago in reply to fly100

TI__Expert 4475 points

Hi,

Could you check if muxing mcasp0_aclkr signal is not overwritten by mmc0_pin_mux[] / mmc0_no_cd_pin_mux[] after your initialization of ddr3 enable.

BR
Ivan

0 fly100 over 11 years ago in reply to Ivan Matrakov

Intellectual 620 points

Firstly thank you, I noticed this question. mcasp0_ackr is not overwritten,and the program stoped at the s_init(), mmc pin mux has not been configed at that time.

0 Ivan Matrakov over 11 years ago in reply to fly100

TI__Expert 4475 points

Hi,

OK. Could you tell me the board name. You can see that the configure_module_pin_mux(gpio0_7_pin_mux); line in a mux.c program will execute only if the board name is "A335X_SK". This name is assumed in board_is_evm_sk() in board.c. Could you check this.

BR
Ivan

0 fly100 over 11 years ago in reply to Ivan Matrakov

Intellectual 620 points

yes, the board name is A335X_SK. In the mux.c program will execute the sk_evm_pin_mux[]. thanks

0 fly100 over 11 years ago

Intellectual 620 points

I change to use gpio0_3 to solve this problem. but I didn't understand the reason.thank everyone.

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am3358 change to gpio to enable the ddr3