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
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