Re: embedding dtb file into kernel
On Thu, Feb 12, 2015 at 9:33 PM, K Richard Pixley rpix...@graphitesystems.com wrote: I'm having trouble figuring out how to embed a dtb file into my kernel. I'm thinking that there should be a standard, architecture independent facility for this akin to initramfs, yes? Could someone please either point me to the standard facility, relevant doc, a currently building board that uses the standard facility, or outline what needs to be done to do this with a new board? If it matters, (I can't think why it would), I'm working with powerpc on a 3.10 kernel. But if there are better facilities in other versions I'd appreciate hearing about that too. Thank you in advance. --rich -- To unsubscribe from this list: send the line unsubscribe linux-embedded in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Look into Documentation/powerpc/bootwrapper.txt. It reveals that there is wrapper script which does the trick and this script should be used via Makefile. Both wrapper script and Makefile resides in arch/powerpc/boot/ directory. I think you can figure out how to use it properly from that documentation. -- To unsubscribe from this list: send the line unsubscribe linux-embedded in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
embedding dtb file into kernel
I'm having trouble figuring out how to embed a dtb file into my kernel. I'm thinking that there should be a standard, architecture independent facility for this akin to initramfs, yes? Could someone please either point me to the standard facility, relevant doc, a currently building board that uses the standard facility, or outline what needs to be done to do this with a new board? If it matters, (I can't think why it would), I'm working with powerpc on a 3.10 kernel. But if there are better facilities in other versions I'd appreciate hearing about that too. Thank you in advance. --rich -- To unsubscribe from this list: send the line unsubscribe linux-embedded in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: embedding dtb file into kernel
On 02/12/2015 11:33 AM, K Richard Pixley wrote: I'm having trouble figuring out how to embed a dtb file into my kernel. I'm thinking that there should be a standard, architecture independent facility for this akin to initramfs, yes? Could someone please either point me to the standard facility, relevant doc, a currently building board that uses the standard facility, or outline what needs to be done to do this with a new board? If it matters, (I can't think why it would), I'm working with powerpc on a 3.10 kernel. But if there are better facilities in other versions I'd appreciate hearing about that too. The normal method is just to cat the two files together, like so: $ cat zImage filename.dtb zImage_w_dtb See https://community.freescale.com/thread/315543 for one example, on ARM. I'm not sure what the status is for appended DTBs on powerpc, but it's easy enough you can just try it and see what happens. -- Tim -- To unsubscribe from this list: send the line unsubscribe linux-embedded in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: embedding dtb file into kernel
On 2/12/15 14:01 , Tim Bird wrote: On 02/12/2015 11:33 AM, K Richard Pixley wrote: I'm having trouble figuring out how to embed a dtb file into my kernel. I'm thinking that there should be a standard, architecture independent facility for this akin to initramfs, yes? Could someone please either point me to the standard facility, relevant doc, a currently building board that uses the standard facility, or outline what needs to be done to do this with a new board? If it matters, (I can't think why it would), I'm working with powerpc on a 3.10 kernel. But if there are better facilities in other versions I'd appreciate hearing about that too. The normal method is just to cat the two files together, like so: $ cat zImage filename.dtb zImage_w_dtb See https://community.freescale.com/thread/315543 for one example, on ARM. I'm not sure what the status is for appended DTBs on powerpc, but it's easy enough you can just try it and see what happens. -- Tim Thanks! How do I tell the kernel where to find that dtb? Is there a relevant config option? --rich -- To unsubscribe from this list: send the line unsubscribe linux-embedded in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: embedding dtb file into kernel
On 02/12/2015 02:30 PM, K Richard Pixley wrote: On 2/12/15 14:01 , Tim Bird wrote: On 02/12/2015 11:33 AM, K Richard Pixley wrote: I'm having trouble figuring out how to embed a dtb file into my kernel. I'm thinking that there should be a standard, architecture independent facility for this akin to initramfs, yes? Could someone please either point me to the standard facility, relevant doc, a currently building board that uses the standard facility, or outline what needs to be done to do this with a new board? If it matters, (I can't think why it would), I'm working with powerpc on a 3.10 kernel. But if there are better facilities in other versions I'd appreciate hearing about that too. The normal method is just to cat the two files together, like so: $ cat zImage filename.dtb zImage_w_dtb See https://community.freescale.com/thread/315543 for one example, on ARM. I'm not sure what the status is for appended DTBs on powerpc, but it's easy enough you can just try it and see what happens. -- Tim Thanks! How do I tell the kernel where to find that dtb? Is there a relevant config option? Usually you make the dtb from sources in the kernel. I don't know how it works on powerpc, but on arm, the .dts files are located in arch/arm/boot/dts, and you would make the dtb for the corresponding foo.dts source by typing: $ make foo.dtb -- Tim -- To unsubscribe from this list: send the line unsubscribe linux-embedded in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: embedding dtb file into kernel
On 02/12/2015 06:56 PM, Tim Bird wrote: On 02/12/2015 02:30 PM, K Richard Pixley wrote: On 2/12/15 14:01 , Tim Bird wrote: On 02/12/2015 11:33 AM, K Richard Pixley wrote: I'm having trouble figuring out how to embed a dtb file into my kernel. I'm thinking that there should be a standard, architecture independent facility for this akin to initramfs, yes? Could someone please either point me to the standard facility, relevant doc, a currently building board that uses the standard facility, or outline what needs to be done to do this with a new board? If it matters, (I can't think why it would), I'm working with powerpc on a 3.10 kernel. But if there are better facilities in other versions I'd appreciate hearing about that too. The normal method is just to cat the two files together, like so: $ cat zImage filename.dtb zImage_w_dtb See https://community.freescale.com/thread/315543 for one example, on ARM. I'm not sure what the status is for appended DTBs on powerpc, but it's easy enough you can just try it and see what happens. -- Tim Thanks! How do I tell the kernel where to find that dtb? Is there a relevant config option? Usually you make the dtb from sources in the kernel. I don't know how it works on powerpc, but on arm, the .dts files are located in arch/arm/boot/dts, and you would make the dtb for the corresponding foo.dts source by typing: $ make foo.dtb It's probably somewhere in: https://www.kernel.org/doc/Documentation/devicetree/booting-without-of.txt Rob -- To unsubscribe from this list: send the line unsubscribe linux-embedded in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: embedding dtb file into kernel
On 13/02/2015 17:10, Rob Landley wrote: On 02/12/2015 06:56 PM, Tim Bird wrote: On 02/12/2015 02:30 PM, K Richard Pixley wrote: On 2/12/15 14:01 , Tim Bird wrote: On 02/12/2015 11:33 AM, K Richard Pixley wrote: I'm having trouble figuring out how to embed a dtb file into my kernel. I'm thinking that there should be a standard, architecture independent facility for this akin to initramfs, yes? Could someone please either point me to the standard facility, relevant doc, a currently building board that uses the standard facility, or outline what needs to be done to do this with a new board? If it matters, (I can't think why it would), I'm working with powerpc on a 3.10 kernel. But if there are better facilities in other versions I'd appreciate hearing about that too. The normal method is just to cat the two files together, like so: $ cat zImage filename.dtb zImage_w_dtb See https://community.freescale.com/thread/315543 for one example, on ARM. I'm not sure what the status is for appended DTBs on powerpc, but it's easy enough you can just try it and see what happens. -- Tim Thanks! How do I tell the kernel where to find that dtb? Is there a relevant config option? Usually you make the dtb from sources in the kernel. I don't know how it works on powerpc, but on arm, the .dts files are located in arch/arm/boot/dts, and you would make the dtb for the corresponding foo.dts source by typing: $ make foo.dtb It's probably somewhere in: https://www.kernel.org/doc/Documentation/devicetree/booting-without-of.txt Worth pointing out the folk over in linuxppc-dev are usually pretty friendly, may be able to help out with this too. https://lists.ozlabs.org/listinfo/linuxppc-dev Cheers, Hugh -- To unsubscribe from this list: send the line unsubscribe linux-embedded in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
