On the fly rereading config.txt
I'm attempting to build my own bootloader using kexec but would like to know how to reread config.txt without reboots. Maybe a stripped down start.elf? I would try but as far as Google knows there is no publicly available source code. Or, better, just a way to change config.txt properties (without changing the file or rebooting).
Code: Select all
int main() {
try
throw "off table";
} catch (void e) {
printf("Phew...");
}
}
Re: On the fly rereading config.txt
Try the vc* tools , and perhaps tvservice in /opt/vc
ghans
ghans
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Re: On the fly rereading config.txt
AFAIK config.txt is just mostly kernel parameters, which you could pass to the kernel via kexec anyway...
i.e. config.txt would load the kexec based bootloader, then you set more options via the bootloader when it boots the kernel again.
I was playing around with the idea of a kexec based bootloader a while ago when the Pi first came out and that's what I was going to do, just pass stuff to the kernel via kexec
i.e. config.txt would load the kexec based bootloader, then you set more options via the bootloader when it boots the kernel again.
I was playing around with the idea of a kexec based bootloader a while ago when the Pi first came out and that's what I was going to do, just pass stuff to the kernel via kexec
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Re: On the fly rereading config.txt
That's cmdline.txtSirLagz wrote:AFAIK config.txt is just mostly kernel parameters, which you could pass to the kernel via kexec anyway...
i.e. config.txt would load the kexec based bootloader, then you set more options via the bootloader when it boots the kernel again.
I was playing around with the idea of a kexec based bootloader a while ago when the Pi first came out and that's what I was going to do, just pass stuff to the kernel via kexec
Code: Select all
int main() {
try
throw "off table";
} catch (void e) {
printf("Phew...");
}
}Re: On the fly rereading config.txt
Where would I find these online (am using buildroot)ghans wrote:Try the vc* tools , and perhaps tvservice in /opt/vc
ghans
Code: Select all
int main() {
try
throw "off table";
} catch (void e) {
printf("Phew...");
}
}Re: On the fly rereading config.txt
• Don't like the board ? Missing features ? Change to the prosilver theme ! You can find it in your settings.
• Don't like to search the forum BEFORE posting 'cos it's useless ? Try googling : yoursearchtermshere site:raspberrypi.org
• Don't like to search the forum BEFORE posting 'cos it's useless ? Try googling : yoursearchtermshere site:raspberrypi.org
Re: On the fly rereading config.txt
lol. Derp. Getting my stuff confused.RPiJunior wrote:That's cmdline.txtSirLagz wrote:AFAIK config.txt is just mostly kernel parameters, which you could pass to the kernel via kexec anyway...
i.e. config.txt would load the kexec based bootloader, then you set more options via the bootloader when it boots the kernel again.
I was playing around with the idea of a kexec based bootloader a while ago when the Pi first came out and that's what I was going to do, just pass stuff to the kernel via kexec
My Blog - http://www.sirlagz.net
Visit my blog for Tips, Tricks, Guides and More !
WiFi Issues ? Have a look at this post ! http://www.raspberrypi.org/phpBB3/viewtopic.php?f=28&t=44044
Visit my blog for Tips, Tricks, Guides and More !
WiFi Issues ? Have a look at this post ! http://www.raspberrypi.org/phpBB3/viewtopic.php?f=28&t=44044
Re: On the fly rereading config.txt
Oh, I am looking for the more GPU/CPU related options: memory management, clock speeds. Likely the user will want to have to change monitor settings once (in bootloader).
Code: Select all
int main() {
try
throw "off table";
} catch (void e) {
printf("Phew...");
}
}Re: On the fly rereading config.txt
Am I coming across rude? I keep forgetting please and thank you but I find it hard to edit on my phone. Sorry. 
Code: Select all
int main() {
try
throw "off table";
} catch (void e) {
printf("Phew...");
}
}Re: On the fly rereading config.txt
The CPU frequency is managed via Linux .
http://www.mjmwired.net/kernel/Document ... ernors.txt
On the GPU , better ask dom.
The memory can be dynamically managed , there is a config.txt option for it.
AFAIK this feature is based on "CMA".
This article might be useful for you :
http://lwn.net/Articles/396657/
ghans
http://www.mjmwired.net/kernel/Document ... ernors.txt
On the GPU , better ask dom.
The memory can be dynamically managed , there is a config.txt option for it.
AFAIK this feature is based on "CMA".
This article might be useful for you :
http://lwn.net/Articles/396657/
ghans
• Don't like the board ? Missing features ? Change to the prosilver theme ! You can find it in your settings.
• Don't like to search the forum BEFORE posting 'cos it's useless ? Try googling : yoursearchtermshere site:raspberrypi.org
• Don't like to search the forum BEFORE posting 'cos it's useless ? Try googling : yoursearchtermshere site:raspberrypi.org
Re: On the fly rereading config.txt
The cpu_freq thing is good. Thank you very much. But I want to support distros not yet supporting CMA. I have heard of CMA and vc* and I would definitely use it in the distro I will make soon... Thank you very much for your help!ghans wrote:The CPU frequency is managed via Linux .
http://www.mjmwired.net/kernel/Document ... ernors.txt
On the GPU , better ask dom.
The memory can be dynamically managed , there is a config.txt option for it.
AFAIK this feature is based on "CMA".
This article might be useful for you :
http://lwn.net/Articles/396657/
ghans
Code: Select all
int main() {
try
throw "off table";
} catch (void e) {
printf("Phew...");
}
}