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PROCESSOR-SDK-DRA8X-TDA4X: OSPI flash driver

chj yang
Prodigy 200 points

Part Number: PROCESSOR-SDK-DRA8X-TDA4X

Hi, TI support team !

I am using TDA4's OSPI interface to connect to a Micron OSPI flash (MT35XL01GBBA) which the working voltage is 3.3V.

The OSPI flash used on TDA4x EVM is MT35XU512ABA which the working voltage is 1.8V.

In uboot, I have cancelled the selection of OSPI flash and hyper flash, and directly use OSPI flash. 0xFF is returned when reading flash ID.

What configuration do I need to modify when I use the OSPI flash (MT35XL01GBBA)  which the working voltage is 3.3V?

  • 0
    TI__Guru**** 162770 points

    Hi,

    3V parts are limited to 133MHz as per J721e datasheet (vs 166MHz for 1.8V) and also as per flash Datasheet.
    OSPI node needs to updated with appropriate frequency (in U-Boot and kernel):

    diff --git a/arch/arm64/boot/dts/ti/k3-j721e-mcu-wakeup.dtsi b/arch/arm64/boot/dts/ti/k3-j721e-mcu-wakeup.dtsi
    index 31875a917c5d..faccb87acc56 100644
    --- a/arch/arm64/boot/dts/ti/k3-j721e-mcu-wakeup.dtsi
    +++ b/arch/arm64/boot/dts/ti/k3-j721e-mcu-wakeup.dtsi
    @@ -190,8 +190,7 @@
                            cdns,trigger-address = <0x0>;
                            clocks = <&k3_clks 103 0>;
                            assigned-clocks = <&k3_clks 103 0>;
    -                       assigned-clock-parents = <&k3_clks 103 2>;
    -                       assigned-clock-rates = <166666666>;
    +                       assigned-clock-rates = <133000000>;
                            power-domains = <&k3_pds 103 TI_SCI_PD_EXCLUSIVE>;
                            #address-cells = <1>;
                            #size-cells = <0>;

    Similar Change in arch/arm/dts/k3-j721e-mcu-wakeup.dtsi is needed as well.

    Thanks,
    Keerthy

  • 0 in reply to Keerthy J
    Prodigy 200 points

    Hi,

    Thanks for your reply!

    my sdk version is  psdk_rtos_auto_j7_06_01_00_15.

    In U-Boot, I modified the contents of arch/arm/dts/k3-j721e-mcu-wakeup.dtsi as follows :

    ospi0 : spi@47040000 {

             .........

            /* assigned-clock-parents = <&k3_clks  103  2>;

               assinged-clock-rates = <166666666>; */

            assigned-clock-rates = <133000000>;

            ........

    };

    After compiling, load it to the board to run the U-BOOT command，an error occurred:

    => sf  probe 0:0

    ti_sci_clk_set_rate:  set_freq failed (-19)

    Invalid  bus 0 (err=-19)

    Failed to initialiaze SPI flash at 0:0 (error -19) 

    =>

  • 0 in reply to chj yang
    TI__Guru**** 162770 points

    Hi,

    Please try the below diff along with the DT change that you have already made:

    diff --git a/drivers/clk/clk-ti-sci.c b/drivers/clk/clk-ti-sci.c
index 478349f22f..ed1facbbcd 100644
--- a/drivers/clk/clk-ti-sci.c
+++ b/drivers/clk/clk-ti-sci.c
@@ -106,8 +106,7 @@  static ulong ti_sci_clk_set_rate(struct clk *clk, ulong rate)
 	k3_avs_notify_freq(clk->id, clk->data, rate);
 #endif
 
-	/* Ask for exact frequency by using same value for min/target/max */
-	ret = cops->set_freq(sci, clk->id, clk->data, rate, rate, rate);
+	ret = cops->set_freq(sci, clk->id, clk->data, 0, rate, ULONG_MAX);
 	if (ret)
 		dev_err(clk->dev, "%s: set_freq failed (%d)\n", __func__, ret);

    Best Regards,
    Keerthy