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| approaches to safely trying custom kernels |
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Posted by: pkivolowitz - 05-16-2018, 07:18 PM - Forum: Linux on Rock64
- No Replies
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Hi All,
I am coaching two undergrads through a summer research experience doing a deep dive into Linux kernel hacking.
I expect we're going to break the kernel a whole lot. My first task is to master recovering from this gracefully.
Leveraging dim memory from the last time I did something like this (a VAX 11/780 with Berkeley Unix), multiple kernel images could reside on disk (including a known good image). The boot loader could be instructed which to load.
I suspect the process on the Rock64 is similar... Would you be willing to comment if I'm on the right track:
- add USB UART to board.
- ensure U-Boot is flashed
- boot into U-Boot ... select kernel image... boot
Does the FLASH come with U-Boot already present?
Thank you a lot - I am happy to answer any questions you might have about our project (introduce a multiple personality disorder into Ubuntu).
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| Ubuntu password not working |
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Posted by: joemassimino - 05-15-2018, 09:01 AM - Forum: Ubuntu
- Replies (4)
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The first image I loaded on my R18 LTS board was Ubuntu 16.04.3 LTS. It loads fine, but the login credentials say to use ubuntu for the username, and ubuntu again for the password. Bu that does not work.
I tried rebooting the board several times, and I'm not a Newbie either. I expect that nobody is going to know why the passwords don't work, because support never re[plied when I asked them.
The first two lines that come to the screen are numbers with the words Trace.Call after them. What is that about, is the image notifying someone that I am using it? I'm not new to Linux, so that had to be added by whoever created the image.
In any case, has anyone any ideas about the Passwords for ubuntu not working?
Joe
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| RFLink connected to /dev/ttyUSB0 not working |
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Posted by: ulysse132 - 05-15-2018, 08:19 AM - Forum: Linux on Rock64
- Replies (9)
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Hello,
I've build my own RFLink using an arduino. It work very well on RPi.
But I have problem to make it work on Rock64. It worked this morning but after a restart (sudo reboot), it didn't work anymore.
Domoticz is configured to connect to RFLink via /dev/ttyUSB0.
After the restart, I have this error :
Quote:Error: RFLink: Error opening serial port!
I have no idea to solve it. Could you please help me ?
I use ayufan's latest stable version of xenial linux.
On RPi, the solution was to add
to /boot/config.txt but there isn't any config.txt file.
Thanks a lot !
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| unable to switch usb3 ports on |
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Posted by: cglhu - 05-14-2018, 12:15 PM - Forum: Rock64 Hardware and Accessories
- Replies (6)
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Hi all,
I have a problem with the usb3 ports. I run an arch linux installation on a rock64. I followed the instructions in this thread
https://forum.pine64.org/showthread.php?tid=5001
and that helped me to get usb2 ports working. But I can't do the same thing for the usb3 ports (toggle the right gpio to switch the regulator for usb3 on). Mostly I don't know, which gpio port belongs to the usb3 regulator.
Maybe someone can give me a hint.
Thanks in advance and
Best regards,
Christoph
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| Some problems with kernel module und device tree.. |
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Posted by: Osiander - 05-14-2018, 02:32 AM - Forum: General
- No Replies
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Hello guys,
I'm developing a kernel driver for a MOST NIC and have got some problems by reading the chip configuration from device tree.
Here is the configuration:
Code: &i2c2 {
pinctrl-names = "default";
pinctrl-0 = <&i2c2_pins_a>;
status = "okay";
os8104: os8104@41 {
compatible = "smsc,os8104";
reg = <0x41>;
master = <0>;
bypass = <0>;
gpio_reset = <&pio 8 17>; /* PI17 */
gpio_int = <&pio 8 16>; /* PI16 */
gpio_aint = <&pio 8 19>; /* PI19 */
gpio_error = <&pio 8 18>; /* PI18 */
};
};
My NIC (os8104) is connected to i2c-2.
And here is the corresponding code in LKM:
Code: static int os8104_probe(struct i2c_client *client, const struct i2c_device_id *id) {
struct device_node *dn;
int rc;
int master = 0, bypass = 0;
struct os8104 *priv;
dn = of_find_node_by_name(NULL, os8104_driver.driver.name);
if (dn == NULL) {
return -ENODEV;
}
rc = of_property_read_u32(dn, "master", &master);
pr_err("rc = %d, master = %11d\n", rc, master);
rc = of_property_read_u32(dn, "bypass", &bypass);
pr_err("rc = %d, bypass = %11d\n", rc, bypass);
priv = devm_kzalloc(&client->dev, sizeof(*priv), GFP_KERNEL);
if (!priv) {
return -ENOMEM;
}
priv->adapter = to_i2c_adapter(client->dev.parent);
priv->client = client;
priv->mode = val;
priv->gpio_reset = of_get_named_gpio(dn, "gpio_reset", 0);
priv->gpio_int = of_get_named_gpio(dn, "gpio_int", 0);
priv->gpio_aint = of_get_named_gpio(dn, "gpio_aint", 0);
priv->gpio_error = of_get_named_gpio(dn, "gpio_error", 0);
return 0;
}
If I'm loading the module, the function of_find_node_by_name find my os8104 node, then I'm able to read the both properties (master and bypass).
But, if I do an of_get_named_gpio(dn, "gpio_reset", 0), I get for each of four gpio-properties
Quote:[ 1610.330108] OF: /soc@01c00000/i2c@01c2b400/os8104@41: arguments longer than property
in dmesg.
Any ideas?
Kernel version is 4.14.39 and SBC is a BananaPRO (Allwinner A20 SoC).
Many thanks. 
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| Screen flickering when playing multiple videos with rkximagesink |
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Posted by: matwey - 05-14-2018, 02:10 AM - Forum: Linux on Rock64
- Replies (2)
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Hello,
I am running gstreamer-rockchip-extra on Rock64 SBC (RK3328) with the following software. - Linux kernel 4.4.120-rockchip-ayufan-209
- gstreamer-rockchip-extra 1.10
- gstreamer-rockchip 1.10-5ayufan12
- librockchip-mpp1 1.4.0-1ayufan3-2
I try to run two H264 video simultaneously as the following:
Code: gst-launch-1.0 uridecodebin uri=file:///home/rock64/big_buck_bunny_480p_h264.mov ! rkximagesink
I see constant flickering in both windows. It seems that every other frame is replaced by black rectangle.
Short video explaining what I see is available at https://transfer.sh/j1PII/gst-rockchip.mp4
Here is initial github issue:
https://github.com/rockchip-linux/gstrea...a/issues/2
But people at #rockchip-linux IRC channel said that they do not reply at github and I have to report it here.
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| Summer Undergraduate Research using Pine64's |
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Posted by: pkivolowitz - 05-13-2018, 09:20 PM - Forum: Ubuntu
- Replies (3)
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Hi All,
I am leading two undergraduates on a summer research experience. My question follows this brief project description.
The goal of the project is educational not necessarily practical so after reading what comes next causes you to say to yourself: Why would you do that? The answer is to get down and dirty and learn.
We aim to modify Ubuntu to assert affinity only over certain cores and a portion of physical memory and during boot, load and launch a parallel real time OS. Certain hardware on the Pine64 will be stripped from Ubuntu and given over to the conjoined twin. Hardware related code such as interrupt handling will be modified to multiplex as needed. A thread safe intercommunications portal will exist allowing applications on Linux to exchange data with plugins running on the conjoined twin.
My first question is to confirm I'm downloading the right source code for this purpose (work starts in 3 weeks so I'm getting prepared).
Was this the right place? https://github.com/ayufan-rock64/linux-kernel.git
Thank you all
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| Xen hypervisor on Rock64 |
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Posted by: tumbleweed - 05-13-2018, 09:03 PM - Forum: Linux on Rock64
- Replies (6)
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Hello,
I'm trying to install the Xen hypervisor on rock64, starting with the info at Xen ARM with Virtualization.
Here are the steps I followed so far:
- Installed a minimal debian stretch image on the rock64 mmc (thanks @ayufan !)
- Built Xen on rock64 (for XEN_TARGET_ARCH=arm64)
- Used mkimage to prep xen for uboot: mkimage -A arm -C none -T kernel -a 0x00800800 -e 0x00800800 -d dist/install/boot/xen xen-uImage
- Modified //boot/efi/extlinux/extlinux.conf to add a custom configuration that loads the xen kernel (xen-uImage) using the same dtb that came with the stretch image (see config code below)
- Reboot with serial console attached, select my custom extlinux configuration
- rock64 hangs (serial output stops) at "Starting kernel ..."
As far as I know, nobody has written up a guide to doing this, on any RK3328 board, and it's my first time trying.
Anyone have suggestions on what I might try next to get past this hanging problem?
Code: label kernel-xen
kernel /xen-uImage
initrd /initrd.img
fdt /dtb
append earlyprintk=uart8250-32bit,0xff130000 rw root=LABEL=linux-root rootwait rootfstype=ext4 panic=10 init=/sbin/init coherent_pool=1M ethaddr=${ethaddr} eth1addr=${eth1addr} serial=${serial#} cgroup_enable=cpuset cgroup_memory=1 cgroup_enable=memory swapaccount=1
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