From: Claudio Fontana <claudio.fontana@huawei.com>
To: Semion Prihodko <semion.ababo@gmail.com>,
Christopher Covington <cov@codeaurora.org>
Cc: QEMU Developers <qemu-devel@nongnu.org>
Subject: Re: [Qemu-devel] HelloWord kernel for qemu-system-aarch64
Date: Fri, 5 Sep 2014 18:57:00 +0200 [thread overview]
Message-ID: <5409EB5C.1060407@huawei.com> (raw)
In-Reply-To: <CAOLuvB25cvZuhMea4_2AuO=cZY2GKG9YEamnEfHbizm7JzgT-w@mail.gmail.com>
On 05.09.2014 16:50, Semion Prihodko wrote:
> Let's discard semihosting. I have aarch64-linux-gnu-* toolchain and
> qemu-system-aarch64 emulator. How can I build a minimal kernel which
> outputs Hello World! via serial port and run it on the emulator?
>
If you run qemu with the "virt" platform, you can write to the UART at 0x9000000
to get a character out, works very early.
You could check the AArch64 port of the OSv Operating System, has a simple boot loader
you can look at (arch/aarch64/preboot.S and arch/aarch64/boot.S)
and the pl011 device you find in drivers/pl011.cc
https://github.com/cloudius-systems/osv/wiki/AArch64
Good luck,
Claudio
>
> 2014-09-04 21:15 GMT+03:00 Christopher Covington <cov@codeaurora.org>:
>
>> Hi Semion,
>>
>> On 09/04/2014 09:40 AM, Semion Prihodko wrote:
>>> Still don't know how to build/run a simple Hello World kernel on
>>> qemu-system-aarch64?
>>>
>>> Guys, this is a very basic thing, please provide concrete steps. Thanks.
>>
>> Here you go. Start at the wget.
>>
>> http://lists.gnu.org/archive/html/qemu-devel/2014-07/msg03487.html
>>
>> Angel semihosting isn't implemented upstream so a text hello world won't be
>> trivial, although given enough time it should be possible to implement
>> Angel
>> semihosting for A64 in QEMU, implement DCC in QEMU and Newlib/libgloss or
>> implement PL011 UART or VirtIO-MMIO console in Newlib/libgloss.
>>
>> Some of the bootloaders and firmwares out there (bootwrapper, ARM trusted
>> firmware, UEFI/Tianocore) may have examples of using the PL011 UART.
>>
>> Christopher
>>
>> --
>> Employee of Qualcomm Innovation Center, Inc.
>> Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
>> hosted by the Linux Foundation.
>>
next prev parent reply other threads:[~2014-09-05 16:57 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-04 10:40 [Qemu-devel] HelloWord kernel for qemu-system-aarch64 Semion Prihodko
2014-09-04 13:29 ` Peter Maydell
2014-09-04 13:40 ` Semion Prihodko
2014-09-04 13:44 ` Peter Maydell
2014-09-04 13:49 ` Semion Prihodko
2014-09-04 13:50 ` Peter Maydell
2014-09-04 18:15 ` Christopher Covington
2014-09-05 14:50 ` Semion Prihodko
2014-09-05 16:57 ` Claudio Fontana [this message]
2014-09-05 17:52 ` Semion Prihodko
2014-09-05 18:27 ` Christopher Covington
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=5409EB5C.1060407@huawei.com \
--to=claudio.fontana@huawei.com \
--cc=cov@codeaurora.org \
--cc=qemu-devel@nongnu.org \
--cc=semion.ababo@gmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.