dts file questions

dts file questions

[Brenden Lai]

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Hi all ,
               I have couple dts questions about  porting OpenBMC into a new machine .


  1.  Although  there are many dts file located in  https://github.com/openbmc/linux/blob/dev-4.13/arch/arm/boot/dts/ ,
But , how does bitbake know which one should be applied .

  1.  if there are no suitable dts file in github , it should be made by myself , where should I put my dts file in working space  source tree?



Brenden Lai
SR. BMC Design Engineer
E&I, Jabil Design Services


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Re: dts file questions

[Konstantin Klubnichkin]

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RE: dts file questions

[Brenden Lai]

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Thanks  Konstantin !
Bye the way ,
If I would like to access ast_2500 peripheral  such as LPC , I2C  in uboot,
Are there any specific file have to modify as well as dts  for kernel ?



From: Konstantin Klubnichkin <kitsok@yandex-team.ru>
Sent: Tuesday, January 29, 2019 4:29 PM
To: Brenden Lai <Brenden_Lai@jabil.com>; openbmc@lists.ozlabs.org
Subject: Re: dts file questions

Hello, Brenden!


29.01.2019, 07:08, "Brenden Lai" <brenden_lai@jabil.com<mailto:brenden_lai@jabil.com>>:

Hi all ,

               I have couple dts questions about  porting OpenBMC into a new machine .


1.      Although  there are many dts file located in  https://github.com/openbmc/linux/blob/dev-4.13/arch/arm/boot/dts/ ,

But , how does bitbake know which one should be applied .

You describe the needed device tree in the machine config file:

KERNEL_DEVICETREE = "${KMACHINE}-bmc-yandex-${MACHINE}.dtb"


1.      if there are no suitable dts file in github , it should be made by myself , where should I put my dts file in working space  source tree?
To do so you can create an append recipe to linux-aspeed, and copy the needed file to the kernel source tree:
========================================================================
$cat linux-aspeed_%.bbappend
FILESEXTRAPATHS_prepend := "${THISDIR}/${PN}:"

SRC_URI += "file://aspeed-bmc-yandex-my70.dts"
SRC_URI += "file://my70.cfg"

do_patch_append() {
    install -m 0644 ${WORKDIR}/aspeed-bmc-yandex-my70.dts ${STAGING_KERNEL_DIR}/arch/arm/boot/dts/aspeed-bmc-yandex-my70.dts
}
========================================================================


Brenden Lai
SR. BMC Design Engineer
E&I, Jabil Design Services




--
Best regards,
Konstantin Klubnichkin,
lead firmware engineer,
server hardware R&D group,
Yandex Moscow office.
tel: +7-903-510-33-33


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