Re: [beagleboard] How to replace 4.4.x Linux kernel in BBB eMMC after cross compiling from source?

[jirkarck]

Thank you very much, this worked well!

Please, could you tell me, what is the default make path of kernel modules? 
A have not found them after compilation.

Dne úterý 9. ledna 2018 22:49:08 UTC+1 Dennis K napsal(a):
>
> Robert,
>
> Thanks that was just what I needed.
> I have successfully rebooted the system with the new kernel.
>
> I did have to do some more research since I had neglected to compile and 
> install the modules to a folder, but I was able to get through that.
>
> One thing that bothers me is whether I need to do anything about the 
> kernel headers.
>
> I was wondering since I still can not access /dev/mem.
> There is something locking me out that I need to find and change.
>
> I know that the c program that I have to access /dev/mem works since I was 
> able to get it to work with an older kernel but I was forced to upgrade 
> because with the older kernel the pru_rproc driver did not work.
>
> Dennis
>
> On Friday, January 5, 2018 at 4:08:14 PM UTC-5, RobertCNelson wrote:
>>
>> On Fri, Jan 5, 2018 at 2:59 PM, Dennis K  
>> wrote: 
>> > 
>> > I need to recompile my current Beaglebone Black Linux kernel (4.4.91) 
>> to set 
>> > CONFIG_STRICT_DEVMEM=n. 
>> > This will allow the use of mmap to access the SPI interface hardware 
>> > directly, among other things. 
>> > 
>> > So far... 
>> > I have loaded the latest version of arm-linux-gnueabihf gcc. 
>> > Cloned the latest kernel source (
>> https://github.com/beagleboard/linux/git) 
>> > which is currently 4.4.91. 
>> > Modified the kernel config options to set CONFIG_STRICT_DEVMEM=n. 
>> > Compiled the kernel. 
>> > Cloned, patched, and compiled u-boot. 
>> > 
>> > At this point the instructions that I have been following diverge and 
>> are 
>> > more concerned with creating a bootable image 
>> > on the SD card for testing or for replacing the entire contents of the 
>> eMMC 
>> > on the Beaglebone. 
>> > 
>> > What I want to do is replace the existing kernel on eMMC with minimal 
>> impact 
>> > to the current configuration. 
>> > My current filesystem is BeagleBoard.org Debian Image 2016-05-13. 
>> > 
>> > Can someone explain the process to replace the kernel on eMMC? 
>>
>> First cat ./include/generated/utsrelease.h in your build directory: 
>>
>> You'll see something similar like: 
>>
>> #define UTS_RELEASE "4.14.12-4-gdb0cd0519e45" 
>>
>> That's your Kernel Version, then just follow this: 
>>
>> Copy zImage to /boot/vmlinuz-`Kernel Version` 
>> Copy *.dtb to /boot/dtbs/`Kernel Version`/ 
>> Copy modules to /lib/modules/`Kernel Version` 
>> Edit /boot/uEnv.txt and update uname_r=`Kernel Version` 
>>
>> Regards, 
>>
>> -- 
>> Robert Nelson 
>> https://rcn-ee.com/ 
>>
>

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Re: [beagleboard] How to replace 4.4.x Linux kernel in BBB eMMC after cross compiling from source?

[jirkarck]

Thank You very much, it works well!

Please, could you tell me, what is the default path of module compiling 
output? I have compiled kernel and modules, kernel is in 
./linux/arch/arm/boot/, but I can not find .ko files anywhere...

Many thanks.

Dne pátek 5. ledna 2018 22:08:14 UTC+1 RobertCNelson napsal(a):
>
> On Fri, Jan 5, 2018 at 2:59 PM, Dennis K  > wrote: 
> > 
> > I need to recompile my current Beaglebone Black Linux kernel (4.4.91) to 
> set 
> > CONFIG_STRICT_DEVMEM=n. 
> > This will allow the use of mmap to access the SPI interface hardware 
> > directly, among other things. 
> > 
> > So far... 
> > I have loaded the latest version of arm-linux-gnueabihf gcc. 
> > Cloned the latest kernel source (
> https://github.com/beagleboard/linux/git) 
> > which is currently 4.4.91. 
> > Modified the kernel config options to set CONFIG_STRICT_DEVMEM=n. 
> > Compiled the kernel. 
> > Cloned, patched, and compiled u-boot. 
> > 
> > At this point the instructions that I have been following diverge and 
> are 
> > more concerned with creating a bootable image 
> > on the SD card for testing or for replacing the entire contents of the 
> eMMC 
> > on the Beaglebone. 
> > 
> > What I want to do is replace the existing kernel on eMMC with minimal 
> impact 
> > to the current configuration. 
> > My current filesystem is BeagleBoard.org Debian Image 2016-05-13. 
> > 
> > Can someone explain the process to replace the kernel on eMMC? 
>
> First cat ./include/generated/utsrelease.h in your build directory: 
>
> You'll see something similar like: 
>
> #define UTS_RELEASE "4.14.12-4-gdb0cd0519e45" 
>
> That's your Kernel Version, then just follow this: 
>
> Copy zImage to /boot/vmlinuz-`Kernel Version` 
> Copy *.dtb to /boot/dtbs/`Kernel Version`/ 
> Copy modules to /lib/modules/`Kernel Version` 
> Edit /boot/uEnv.txt and update uname_r=`Kernel Version` 
>
> Regards, 
>
> -- 
> Robert Nelson 
> https://rcn-ee.com/ 
>

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