ion. I had
analyzed this pci-epf-test.c before and right after sending my question I
realized how it's working after searching 'raise_irq' in the endpoint test
code.
Thank you.
Best regards,
Chan Kim
>-Original Message-
>From: Chan Kim
>Sent: Thursday, September 14, 2023 2:39 PM
re can I find the corresponding (acting on
the register triggering above) action in the endpoint side?
If you have once seen these codes and send me any hint or suggestion, I'll
be grateful.
Thank you.
Best regards,
Chan Kim
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the BAR
memory address of the pci_device?
How do we control from which memory (host memory or PCIe device memory) to
allocate memory? Is BAR memory only for explicit allocation by the driver
only?
Thank you.
Chan Kim
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more easier to read. I hope someone do this someday..
Thank you.
Chan Kim
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MMU betwen the PCIe and ITS).
Any comment will be really appreciated.
Thank you!
Chan Kim
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er.
Thank you!
Chan Kim
From: Chan Kim
Sent: Friday, June 2, 2023 6:28 PM
To: U-Boot Mailing List ; 'qemu-disc...@nongnu.org'
; kernelnewbies@kernelnewbies.org
Subject: Running u-boot and linux on qemu arm64 virt machine, linux shell
does not respond..
Hello all,
I'm trying to
st what I can try to solve this problem? (I mean, the
problem of linux shell not responding in qemu virtual machine)
I would appreciate it for any comment or help.
Thank you.
Chan Kim
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Hello Valdis,
>-Original Message-
>From: Valdis Kletnieks On Behalf Of Valdis Kl?tnieks
>Sent: Tuesday, March 14, 2023 2:15 PM
>To: Chan Kim
>Cc: kernelnewbies@kernelnewbies.org
>Subject: Re: returned dma address value of dma_alloc_coherent, is it always
>i
(= bus address) is not equal to the
physical address and is assigned by the OS for convenience)
Thank you.
Chan Kim
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I would appreciate if someone could clear things up for me.
Thank you.
Chan Kim
>-Original Message-
>From: Chan Kim
>Sent: Monday, February 6, 2023 9:07 PM
>To: kernelnewbies@kernelnewbies.org
>Subject: In device tree, can't understand 'ranges' property of PCIe root
>com
ng. But
I'm not sure if my guess is correct.
Can any one tell me what the case is?
Thank you.
Chan Kim
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ction to a certain PCIe bus address and
I guess setting BAR can be done without this 'ranges' information(it will
assign free address range for that device according to the device's need).
By the time linux kernel later reads this 'ranges' property, the BIOS (or
bootloader) has already assig
size in byte unit? Or is it number of pages?
Thank you.
Chan Kim
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Hi, all,
I was able to get cma-reserved region by adding CONFIG_DMA_CMA=y.
This is the result.
Memory: 233708K/1048576K available (3200K kernel code, 386K rwdata, 808K
rodata, 7808K init, 105K bss, 28436K reserved, 786432K cma-reserved)
Thanks!
Chan Kim
>-Original Message-
>From
MORY_ISOLATION=y
CONFIG_CONTIG_ALLOC=y
ONFIG_CMA=y
CONFIG_CMA_DEBUG=y
CONFIG_CMA_DEBUGFS=y
CONFIG_CMA_SYSFS=y
CONFIG_CMA_AREAS=7
# CONFIG_DMA_CMA is not set
I tried adding 'cma=768MB' in the boot args or changed CONFIG_CMA_AREAS to 1
but it is the same.
W
for now.
Thank you.
Chan Kim
>-Original Message-
>From: Nicholas Mc Guire
>Sent: Monday, January 2, 2023 4:23 AM
>To: Bernd Petrovitsch
>Cc: kernelnewbies@kernelnewbies.org
>Subject: Re: How is the size of init ram disk determined when initramfs is
>used?
>
>On
as reserved-memory). Is this kind
things impossible?
Thank you for reading
Best regards,
Chan Kim
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" What does it mean? Does the OS do something with this 'ranges'
value?
I'll appreciated if someone could explain it to me.
Thank you!
Chan Kim
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There is a typo : Setting cntfrq_el0 is done by " msr cntfrq_el0, x0 " in
the code.
>-Original Message-
>From: Chan Kim
>Sent: Tuesday, November 8, 2022 2:16 PM
>To: 'kernelnewbies@kernelnewbies.org'
>Cc: 'Siddh Raman Pant' ; 'Linus Probert'
>
>Subj
ater (like with "writel(COUNTER_FREQUENCY,
0x4c018020);").
Hope this helps someone later.
Thank you!
Chan Kim
>-Original Message-
>From: Chan Kim
>Sent: Saturday, November 5, 2022 8:46 PM
>To: 'Siddh Raman Pant'
>Cc: 'Kernel Newbies'
>Subject: RE: clock_getti
the pc_clock_gettime function as you showed to see how it works.
Thanks for the advices.
Chan Kim
>-Original Message-
>From: Siddh Raman Pant
>Sent: Saturday, November 5, 2022 4:51 AM
>To: Chan Kim
>Cc: Kernel Newbies
>Subject: Re: clock_gettime function doesn't scale to real ti
mes shorter but it is the same!
I couldn't find how linux uses clock_gettime.
How can I solve this problem?
Any advice will be deeply appreciated.
Thank you!
Chan Kim
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archive is extracted in the ramdisk.
Then how is the ramdisk size determined? During the build usig Kconfig
variable, or does it dynamically grow?
Thanks in advance.
Chan Kim
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https
and problems during syscall in
the shell (like rwsem hang) disappeared.
Thank you!
Chan Kim
>-Original Message-
>From: Chan Kim
>Sent: Thursday, September 22, 2022 10:23 PM
>To: 'Greg KH'
>Cc: kernelnewbies@kernelnewbies.org
>Subject: RE: how to debug... program h
And I am also trying to do the experiment with linux5.15.68.
Somehow linux doesn't start with this new setup and I need some time.
Thank you for the advices.
Chan Kim
>-Original Message-
>From: Chan Kim
>Sent: Thursday, September 22, 2022 10:18 PM
>To: 'Greg KH'
>Cc:
using).
Thank you.
Chan Kim
>-Original Message-
>From: Greg KH
>Sent: Wednesday, September 21, 2022 8:16 PM
>To: Chan Kim
>Cc: kernelnewbies@kernelnewbies.org
>Subject: Re: how to debug... program hangs while downing for write a rwsem
>
>On Wed, Sep 21, 2022 at 08
nd rw
semaphores etc. but could anyone give me any suggestion on what can be going
wrong? Or what to check first?
Any suggestion will be really appreciated.
Thank you!
Chan Kim
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reading part of a book or web posts but didn't get what I want
yet).
Thank you!
Regards,
Chan Kim
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week
by adding some prints.
If anyone has any idea about what might be wrong, please tell me.
Thanks for reading.
Chan Kim
From: Chan Kim
Sent: Thursday, August 18, 2022 3:02 PM
To: kernelnewbies@kernelnewbies.org
Subject: RE: busybox shell doesn't come up or get stuck.. where should I
n't start so 'running exec inside a
script' can have a problem.
If anyone has a suggestion or advice, I welcome it.
Thank you!
Chan Kim
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aarch64-none-linux-gcc -static
-o init test.c".
When 'init' was a script, some lines of it was processed ok, but when I
replace 'init' to a binary program, it just failed with -2.
I find error code 2 is 'No such file or directory' which is strange because
my 'init' program was under / when I made the
sybox applet /bin/sh is stuck somewhere.
Can anybody tell me where I should look? Or how to debug this?
Thanks in advance!
Chan Kim
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nel)
Thank you.
Chan Kim
>-Original Message-
>From: Chan Kim
>Sent: Monday, July 18, 2022 5:43 PM
>To: kernelnewbies@kernelnewbies.org
>Subject: Confused about how to apply add-symbol-file in gdb
>
>Hello all,
>
>I thought I know how to apply add-symbol-file comma
at 0x8000 and dtb was at
0x8280 and just by giving "add-symbol-file vmlinux" again, there was no
problem following the kernel source in virtual address.
How should I give the add-symbol-file command when the Image is now at
0x8001??
Any comment welcome.
Thank you.
e I could find where
the program is loaded and set breakpoint in the tftp entrance or condition,
but couldn't find where busybox was loaded.)
Thank you.
Chan Kim
>-Original Message-
>From: Richard
>Sent: Friday, July 8, 2022 8:46 AM
>To: kernelnewbies@kernelnewbies.org
&
Hi all,
I'm trying to track how tftp program runs when I run tftp provided by
busybox on qemu virtual machine.
I can debug the linux source but I cannot debug tftp (busybox) program.
Can I debug busybox program using gdb in this case?
Any hint or advice will be very appreciated.
Thank you!
Chan
ave a nice day!
Chan Kim
>>-Original Message-
>>From: Wonhyuk Yang
>>Sent: Friday, June 24, 2022 3:41 PM
>>To: Chan Kim
>>Cc: kernelnewbies
>>Subject: Re: A question about memblock.reserved
>>
>>On Thu, Jun 23, 2022 at 2:25 PM Chan Kim
served-memory' regions are put into this memblock.reserved
regions during the boot process?(I mean during dtb parsing).
Thank you!
Chan Kim
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us. Yes, I can
understand that.
My question is, In arm's SMMUv3 case, how is this rid used in setting up the
stream table (or context table)?
Is rid equal to StreamID in SMMUv3?
Any comment or explanation will be really appreciated.
Thank you!
Chan Kim
__
le, does it mean the SoC just contains a system control
block containing many registers for controlling pcie mode, clock settings,
etc?
If that is true, maybe I'll have to use this trick myself for pass system
settings to the kernel.
Any comment will be appreciated.
Thank you!
Chan Kim
It looks like these values in pci_dev.resources are filled in pci_read_bases
function which is called in pci_setup_device function.
So linux is reading the values set by the BIOS and setting them in its
pci_dev struct. And the devices's driver is called after that.
Chan Kim
> -Origi
s it done by the BIOS(or
UEFI) before linux boots?
Probably not because this pci_dev struct is from linux and should be filled
by linux code and I couldn't find where it's done.
Chan Kim
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ld confirm this.
(and the dma-ranges property seems to be the relationship between PCI
address and the host side memory address)
Thank you!
Chan Kim
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Hello linux experts,
I'm almost sure my understanding is correct but hope someone could confirm
me if it's really correct.
Suppose a user program wants to pass to a device some data structures
connected to each other using pointers and the device processes the data
with dma capability(meaning it
Hi folks,
Sorry for many emails.
I just found out by turning CONFIG_ARM64_PTR_AUTH off in armv8.3 when building
linux, I can avoid this problem.
(I noticed the instruction ‘pacia’ in the function assembly code)
Thank you.
Chan Kim
From: Chan Kim
Sent: Wednesday, April 27, 2022 6:05 PM
, and if I repeat
fixing this stored x30 values, I can see more backtrace information. I filed a
bug report to bug.linaro.org. This strange thing doesn’t happen with linux
version < 5.10 to me so it doesn’t look like qemu bug.
Chan Kim
From: Chan Kim
Sent: Tuesday, April 26, 2022 10:47
nction) is really 0xb8cd80001076a594 which is weird (not a
kernel address). The following 3 values are function arguments for
bus_for_each_dev and they look correct.
From: Chan Kim
Sent: Saturday, April 23, 2022 8:37 AM
To: 'Mulyadi Santosa'
Cc: 'qemu-devel' ; 'kernelnewbies'
Subje
, 2022 11:53 PM
To: Chan Kim
Cc: qemu-devel ; kernelnewbies
Subject: Re: Backtrace stopped: previous frame identical to this frame (corrupt
stack?) , even with fresh qemu and linux build
On Fri, Apr 22, 2022 at 7:30 PM Chan Kim mailto:c...@etri.re.kr> > wrote:
Hello all,
censes/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Thank you.
Chan Kim
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be reading the references again soon)
Chan
From: Ozgur Karatas
Sent: Tuesday, April 12, 2022 4:15 PM
To: Chan Kim
Cc: Greg KH ; kernelnewbies@kernelnewbies.org; qemu-discuss
Subject: Re: Can't understand /proc/interrupts output for GICv3 case
On Tue, Apr 12, 2022 at 6:44 AM Chan Kim
goto r_device;
}
ret = request_irq(i, axpu_irq_handler, IRQF_SHARED, "axpu_irq",
_cdev);
This way I could find the correct irq number on ubuntu and vanilla linux.
Hope this is helpful to someone. (anyway you know the hardware connection so
you can use it)
Thank you!
Ch
Hi Greg KH,
I see, I understand what the proper method should be for this.
I'll take it as an almost official answer from the linux people :)
Thank you.
Chan Kim
> -Original Message-
> From: 'Greg KH'
> Sent: Tuesday, April 12, 2022 1:50 PM
> To: Chan Kim
> Cc
Hi Ozgur,
My replies in-line.
Thanks!
From: Ozgur Karatas
Sent: Monday, April 11, 2022 11:53 PM
To: Chan Kim
Cc: Greg KH ; kernelnewbies@kernelnewbies.org; qemu-discuss
Subject: Re: Can't understand /proc/interrupts output for GICv3 case
Re-hi,
On Mon, Apr 11, 2022 at 6:16
Hi, Greg KH,
Thanks for the advices.
Some questions inline.
> -Original Message-
> From: 'Greg KH'
> Sent: Monday, April 11, 2022 11:26 PM
> To: Chan Kim
> Cc: 'qemu-discuss' ;
> kernelnewbies@kernelnewbies.org
> Subject: Re: Can't understand /proc/interrupts
AL
printk(KERN_INFO "Device driver inserted ..done properly..\n");
return 0;
r_device :
class_destroy(dev_class);
r_class :
unregister_chrdev_region(dev,1);
return -1;
}
Thank you.
Chan Kim
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Kara
Sent: Monday, April 11, 2022 10:10 PM
To: Chan Kim ; 'qemu-discuss' ;
kernelnewbies@kernelnewbies.org
Subject: Re: Can't understand /proc/interrupts output for GICv3 case
Hello,
firstly when you say SPI so can you give some more information about your
hardware?
I think you are doing
ce). What function should I use to get the irq number in this case?
I couldn't find a function with a likely name in the tags file for linux
source.(5.4.188)
Thanks a lot!
Chan Kim
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registered the handler by request_irq(6,...) and the interrupt works
fine.
So now my question is : how can find my irq number (correct irq_desc number)
in kernel driver module?
I'll appreciate it if you could tell me how to do it.
Thank you!
Chan Kim
> -Original Message-
> From: Ch
thought I connected my device (axpu) to SPI 15 in qemu code but this GICv3
input number changes according to with what number I called reqeust_irq.
Could anyone tell me what is going on here?
Thank you.
Chan Kim
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Kernelne
s 0.
So this irq_desc problem was solved(?) for now. (I don't know why this is so
small when CONFIG_SPARSE_IRQS=y).
And still the handler is not called even when I set qemu_set_irq.
_
From: Chan Kim
S
AML_EXCLUSIVE, , 1));
aml_append(dev, aml_name_decl("_CRS", crs));
aml_append(scope, dev);
}
I'm not sure if I can just use _HID value as "AXPU0011".
If you see anything wrong and have a suggestion, please tell me.
Thank you!
Chan Kim
Hello all,
I found how to do it, I had asked it on stackoverflow.com and posted it as
an answer there.
Please see if you are interested.
https://stackoverflow.com/questions/71749640/how-can-i-debug-kernel-module-r
unning-on-a-virtual-machine/71753139#71753139
Thank you!
Chan Kim
for the driver image relative to that loaded address, it is
possible to do kernel module debug. I think this is what driver developers
will be doing always. Please tell me how I can do it. If this is possible,
it will save many days for me.
Thank you!
Chan Kim
handler = irq_default_primary_handler;
}
Thanks for reading.
Chan Kim
> -Original Message-
> From: Chan Kim
> Sent: Monday, April 4, 2022 11:16 PM
> To: kernelnewbies@kernelnewbies.org
> Subject: request_irq not working.. what else should I do?
>
>
controller but it doesn't work. That's what OS is for, isn't it?
But when I follow the qemu code, in the distributor stage, it says there is
no pending interrupt.
How can I set the interrupt priority using request_irq function above?
Thank you!
Chan Kim
;root=/dev/ram init=/init
nokaslr earlycon ip=dhcp hugepages=16"
Thanks alot!
Chan Kim
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to change the default setting for arm64 and there should
be an error in my qemu code(this was to avoid an error during u-boot/linux test
on qemu).
Chan
From: FMDF
Sent: Saturday, March 19, 2022 7:24 PM
To: Chan Kim
Cc: kernelnewbies
Subject: Re: arm64 code looking for variable rodata_enabled
the menuconfig window.
(The menu is not visible in the specified location, you can check it yourself.
As you said, some menus become selectable when the condition is met and is
meaningful)
Chan
From: FMDF
Sent: Saturday, March 19, 2022 7:24 PM
To: Chan Kim
Cc: kernelnewbies
Subject: Re: arm
.
Hope that helps.
Regards,
Chan Kim
From: JeongHwan Kim
Sent: Friday, March 18, 2022 4:41 PM
To: Chan Kim ; kernelnewbies@kernelnewbies.org
Subject: Re: Which Page table is appled when MMU is turned on in boot process
of ARM64
Thank you for reply.
I have a question about
can modify init/main.c and include/linux/init.h so that this
rodata_enabled and related functions be defined regardless of these CONFIG
values and make the errors go away, but I'm curious if this a kind of kernel
bug raising compiler error.
Any comment w
Hi JeongHwan,
Recently I followed the kernel boot process so now I understand how it's
doing.
The kernel starts at HEAD and it jumps to primary_entry. (code below is
5.10.0. but in 5.4.21 it jumped to stext, just name change)
Primary_entry looks like this.
SYM_CODE_START(primary_entry)
Hello, JeongHwan,
I'm relatively new to arm64 but there is MAIR (memory attribute indirection
register) which contains bytes holding cacheability, shareability and
protection information and the actual page table contains the 'index' for
the byte in this MAIR.
For example in linux-5.10-0 which
started to look into early_fixmap_init function but can anyone tell
me if this can be the real problem?
Isn't it possible to use 8MB memory to run linux? (I'm doing this before the
board is fully ready)
Thank you!
Chan Kim
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wrote in memory.
Hope this helps anyone.
Thanks!
Chan Kim
From: Chan Kim
Sent: Thursday, February 17, 2022 4:26 PM
To: kernelnewbies@kernelnewbies.org
Subject: weird printk operation early at start_kernel..
Hello all,
I'm debugging linux boot on an FPGA board (with limited RAM size
ime
it goes into vprintk_nmi and seems to hang (waiting for console lock I
remember..).
Could anyone give me some light on what's going on here? (Actual print to
serial port is supposed to come out much later inside setup_arch).
Any comment will be very much appreciated.
Thank you!
Chan Kim
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the System.map file, I cannot find the vprintk_safe
function and vprintk_nmi (I can find vprintk_default). I'm curious if this
may be related to the malfunction.
How can this happen? And how should I understand this?
Thank you!
Chan Kim
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2 1:47 AM
> To: Chan Kim
> Cc: kernelnewbies
> Subject: Re: adding GCC optimze O0 to early_fixmap_init causes compiler
> error (BUILD_BUG failed)
>
> On Sun, Jan 23, 2022 at 4:23 AM Chan Kim wrote:
> >
> > Hello all,
> >
> > In linux 5.4.21, when tell
I found adding __init to gic_smp_init() removed this warning message.
Is it ok to move this function to .init.text ? (doesn't it cause it to be
removed after initialization?)
Chan
From: Chan Kim
Sent: Sunday, January 23, 2022 7:48 PM
To: kernelnewbies@kernelnewbies.org
Subject: how to fix
I found adding the same #pragma directives warp to #include
makes the compiler error go away!
#pragma GCC push_options
#pragma GCC optimize ("O0")
#include
#pragma GCC pop_option
Chan
From: Chan Kim
Sent: Sunday, January 23, 2022 8:23 PM
To: kernelnewbies@kerneln
.
AR drivers/irqchip/built-in.a
AR drivers/built-in.
What does this mean and what should I do?
Thanks!
Chan Kim
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just add add __init to gic_smp_init(). (or remove
_init from set_smp_cross_call )
What is the correct method to fix it?
Thanks,
Chan Kim
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*** [Makefile:1652: drivers] Error 2
Does anybody know how can I use -O0 flag? (I tried -Og flag but some
variables are still optimized out).
Thank you!
Chan Kim
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Hi,
To print kernel virtual address, you should use %px instead of %p in the printk.
Probably that’s why you couldn’t see the pointer values correctly.
Chan
From: admin LI
Sent: Friday, January 14, 2022 6:02 AM
To: kernelnewbies@kernelnewbies.org
Subject: How to disable address
inside
the cpus node(without wrapping with cpu-map node). So even though it is not
uni-processor system, it doesn't have cpu-map node, Just cpu nodes.
What does it mean? Does it mean this system doesn't support SMP? Or, I can
use style without violation?
Any comment/explanation will be very much a
following the link in the id and schema just leads me to
https://www.devicetree.org/schema/# and it says
"These are not the schemas you are looking for."
How can I open the links and use them?
Thanks a lot!
Regards,
Chan Kim
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vp-base-revc.dtb.d
Thanks!
Chan Kim
From: Chan Kim
Sent: Wednesday, October 27, 2021 6:45 PM
To: kernelnewbies@kernelnewbies.org
Subject: DTC compile error (simple-bus unit address format error for
#address-cells = <2> case)
Hello all,
Below is a part of arch/arm64/boot/dt
Hello,
For anyone's help..
I asked this question to unix stackexchage and received an answer.
https://unix.stackexchange.com/questions/674155/what-does-loadaddr-0x2000800
0-mean-in-linux-kernel-make-command
regards,
Chan Kim
From: Chan Kim
Sent: Thursday, October 21, 2021 3:00 PM
;2>, the node address should be given by
chip select number and the offset (inside the chip select).
How can I prevent this error? DTC version is 1.5.0.
Any help will be appreciated.
Thank you!
Chan Kim
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it to
linux kernel.
Is my understanding correct?
Thanks in advance.
Regards,
Chan Kim
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Thanks,
I tried tinyconfig but didn't work even after adding input device and serial
support.
Looks like I have to add some more. (the tinyconfig looked really simple in
menuconfig)
Maybe I'll try more later (allnoconfig too).
Thanks.
Chan
> -Original Message-
> From: Laurent Navet
>
Hi, Adam
Did you tell the OS to reserve huge pages?
(in ubuntu, add vm.nr_hugepages = N in /etc/sysctl.conf or
Add hugepages=16, hugepagesz=256M in bootcommd)
Just in case you didn’t set it.
Thanks,
Chan Kim
From: Adam Turowski
Sent: Friday, October 15, 2021 10:08 PM
To: kernelnewbies
here, I would
really really appreciate it.
Thank you.
Best regards,
Chan Kim
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set). After this
addition, it boots ok to the shell! I was very luck..
Thank you,
Best regards,
Chan Kim
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t=/dev/ram init=/init nokaslr earlycon ip=dhcp" -m 2048M
-nographic -netdev user,id=n1 -device e1000,netdev=n1
Has anyone any idea what I can add in the config or try? (with original
.config, the kernel boots ok to the bash in initramfs)
Any suggestion will be appreciated.
Thank you,
Kin
(work, struct smsc911x_data, rx_work);
struct napi_struct *napi = pdata.napi;
so maybe I can just pass the int budget through a new member value in struct
smsc911x_data.
Has anyone done similar thing before?
Chan
보낸 사람 : Chan Kim c...@etri.re.kr
보낸 날짜 : 2015-06-08 16:06:59 ( +09:00 )
받는 사람
idea on
whether it's impossible, or if there is any example driver using DMA controller
for Ethernet chip? (not Ethernet chips with DMA master function insde)
Best regards,
Chan
보낸 사람 : Chan Kim c...@etri.re.kr
보낸 날짜 : 2015-06-08 16:06:59 ( +09:00 )
받는 사람 : kernelnewbies@kernelnewbies.org
regards,
Chan Kim
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Hi, Anish,
I see in the source (linux ver 3.3) that wake_up_interruptible
function doesn't sleep so I used in it an ISR but I'm getting
'BUG:scheduling while atomic' message. (I'm not sure it's coming from
this)
Remove it and check if the problem goes away.
I later figured out that
Hello,
I see in the source (linux ver 3.3) that wake_up_interruptible function doesn't
sleep so I used in it an ISR but I'm getting 'BUG:scheduling while atomic'
message. (I'm not sure it's coming from this) I'm looking for the exact cause
but Is there any caveat when using
that in this case
(processing going to sleep and woken up by the ISR), I should use some other
method to register my interrupt.
Can anybody give me some advice?
Thanks a lot in advance.
Chan Kim
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