[PATCH v2 5/5] riscv: dts: starfive: jh7110-common: bootph-pre-ram hinting needed by boot loader

[Maud Spierings]

On 2/28/25 8:53 AM, E Shattow wrote:
>
> On 2/6/25 19:01, Hal Feng wrote:
>>> On 06.02.25 19:17, E Shattow wrote:
>>> On 2/5/25 18:59, Hal Feng wrote:
>>>> On 2/5/2025 6:01 PM, Heinrich Schuchardt wrote:
>>>>> On 2/5/25 08:57, Hal Feng wrote:
>>>>>> On 2/3/2025 9:37 AM, E Shattow wrote:
>>>>>>> Add bootph-pre-ram hinting to jh7110-common.dtsi:
>>>>>>>     - i2c5_pins and i2c-pins subnode for connection to eeprom
>>>>>>>     - eeprom node
>>>>>>>     - qspi flash configuration subnode
>>>>>>>     - memory node
>>>>>>>     - uart0 for serial console
>>>>>>>
>>>>>>>     With this the U-Boot SPL secondary program loader may drop such
>>>>>>>     overrides when using dt-rebasing with JH7110 OF_UPSTREAM board
>>> targets.
>>>>>>> Signed-off-by: E Shattow <e at freeshell.de>
>>>>>>> ---
>>>>>>>    arch/riscv/boot/dts/starfive/jh7110-common.dtsi | 6 ++++++
>>>>>>>    1 file changed, 6 insertions(+)
>>>>>>>
>>>>>>> diff --git a/arch/riscv/boot/dts/starfive/jh7110-common.dtsi
>>>>>>> b/arch/riscv/boot/dts/starfive/jh7110-common.dtsi
>>>>>>> index 30c5f3487c8b..c9e7ae59ee7c 100644
>>>>>>> --- a/arch/riscv/boot/dts/starfive/jh7110-common.dtsi
>>>>>>> +++ b/arch/riscv/boot/dts/starfive/jh7110-common.dtsi
>>>>>>> @@ -28,6 +28,7 @@ chosen {
>>>>>>>        memory at 40000000 {
>>>>>>>            device_type = "memory";
>>>>>>>            reg = <0x0 0x40000000 0x1 0x0>;
>>>>>>> +        bootph-pre-ram;
>>>>>>>        };
>>>>>>>          gpio-restart {
>>>>>>> @@ -247,6 +248,7 @@ emmc_vdd: aldo4 {
>>>>>>>        };
>>>>>>>          eeprom at 50 {
>>>>>>> +        bootph-pre-ram;
>>>>>>>            compatible = "atmel,24c04";
>>>>>>>            reg = <0x50>;
>>>>>>>            pagesize = <16>;
>>>>>>> @@ -323,6 +325,7 @@ &qspi {
>>>>>>>        nor_flash: flash at 0 {
>>>>>>>            compatible = "jedec,spi-nor";
>>>>>>>            reg = <0>;
>>>>>>> +        bootph-pre-ram;
>>>>>>>            cdns,read-delay = <2>;
>>>>>>>            spi-max-frequency = <100000000>;
>>>>>>>            cdns,tshsl-ns = <1>;
>>>>>>> @@ -405,6 +408,7 @@ GPOEN_SYS_I2C2_DATA,
>>>>>>>        };
>>>>>>>          i2c5_pins: i2c5-0 {
>>>>>>> +        bootph-pre-ram;
>>>>>>>            i2c-pins {
>>>>>>>                pinmux = <GPIOMUX(19, GPOUT_LOW,
>>>>>>>                              GPOEN_SYS_I2C5_CLK, @@ -413,6 +417,7 @@
>>>>>>> GPI_SYS_I2C5_CLK)>,
>>>>>>>                              GPOEN_SYS_I2C5_DATA,
>>>>>>>                              GPI_SYS_I2C5_DATA)>;
>>>>>>>                bias-disable; /* external pull-up */
>>>>>>> +            bootph-pre-ram;
>>>>>>>                input-enable;
>>>>>>>                input-schmitt-enable;
>>>>>>>            };
>>>>>>> @@ -641,6 +646,7 @@ GPOEN_DISABLE,
>>>>>>>    };
>>>>>>>      &uart0 {
>>>>>>> +    bootph-pre-ram;
>>>>>>>        clock-frequency = <24000000>;
>>>>>>>        pinctrl-names = "default";
>>>>>>>        pinctrl-0 = <&uart0_pins>;
>>>>>> What about &mmc0, &mmc1, &qspi, &sysgpio, &mmc0_pins,
>>> &mmc1_pins, &i2c5?
>>>>>> Why not add "bootph-pre-ram;" for them?
>>>>> Would they be needed before relocation of U-Boot to DRAM?
>>>> Yeah, they are needed by SPL and they are set in U-Boot
>>>> arch/riscv/dts/jh7110-common-u-boot.dtsi.
>>>>
>>>> Best regards,
>>>> Hal
>>>>
>>> When I tested on Star64 there was none of those needed to boot. We can add
>>> more bootph-pre-ram as needed but I want to know how to test (because I
>>> did not see any need for these).
>>>
>>> How do you test that these are needed?
>> In my opinion, SPL need to read U-Boot from EMMC (mmc0) or SDcard (mmc1) or
>> QSPI flash (qspi). Also it need to choose the correct DTB by reading EEPROM
>> mounted on i2c5. To run mmc / i2c drivers, the pin configurations (sysgpio, mmc0/1_pins)
>> are also needed.
>>
>> Best regards,
>> Hal
> EMMC or SDcard are not possible to boot (via JH7110 boot ROM, distinct
> from QSPI boot of U-Boot and later EMMC or SDcard capability) in this
> way on some of the boards where transistor logic pairs GPIO0 and GPIO1
> both-off or both-on. SDcard boot is officially recommended against as
> "not supported" by the StarFive reference documentation, and I suppose
> what remains is EMMC boot as valid though I have not heard of any users
> for this.


I tend to use SDcard boot on my deepcomputing fml13v01 board to test

before I flash the firmware to spi flash. I've not encountered issues. I
have not tried eMMC but I assume it is the same.

> What is the test procedure for EMMC boot, can you explain and I will try
> it on the Star64?


I believe this page contains enough info to use it:

https://docs.u-boot.org/en/latest/board/starfive/visionfive2.html

> -E