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

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Message-ID: <cba21857-7eb2-4f10-a1bd-6743ce63dfa6@freeshell.de>
Date: Thu, 6 Feb 2025 03:17:26 -0800
From: E Shattow <e@...eshell.de>
To: Hal Feng <hal.feng@...ux.starfivetech.com>,
 Heinrich Schuchardt <heinrich.schuchardt@...onical.com>
Cc: linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
 linux-riscv@...ts.infradead.org, Emil Renner Berthing <kernel@...il.dk>,
 Conor Dooley <conor@...nel.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Paul Walmsley <paul.walmsley@...ive.com>, Palmer Dabbelt
 <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>,
 Hal Feng <hal.feng@...rfivetech.com>
Subject: Re: [PATCH v2 5/5] riscv: dts: starfive: jh7110-common:
 bootph-pre-ram hinting needed by boot loader



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@...eshell.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@...00000 {
>>>>           device_type = "memory";
>>>>           reg = <0x0 0x40000000 0x1 0x0>;
>>>> +        bootph-pre-ram;
>>>>       };
>>>>         gpio-restart {
>>>> @@ -247,6 +248,7 @@ emmc_vdd: aldo4 {
>>>>       };
>>>>         eeprom@50 {
>>>> +        bootph-pre-ram;
>>>>           compatible = "atmel,24c04";
>>>>           reg = <0x50>;
>>>>           pagesize = <16>;
>>>> @@ -323,6 +325,7 @@ &qspi {
>>>>       nor_flash: flash@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?

-E