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From: lkcl@lkcl.net (Luke Kenneth Casson Leighton)
To: linux-riscv@lists.infradead.org
Subject: [sw-dev] SBI extension proposal v2
Date: Sat, 10 Nov 2018 05:12:39 +0000	[thread overview]
Message-ID: <CAPweEDySAg6LCTNOKHB2Ax3tJNySi9XQzG4d1msSQQepwDi8Vw@mail.gmail.com> (raw)
In-Reply-To: <4aef7216-726c-f565-5c0f-cebd2aefb46d@wdc.com>

On Sat, Nov 10, 2018 at 2:42 AM Atish Patra <atish.patra@wdc.com> wrote:

> ## Conclusion
> This proposal is far from perfect and absolutely any suggestion is
> welcome. Obviously, there are many other functionalities that can be
> added to this proposal. However, I just wanted to start with something
> that is an incremental change at best to kick off the discussion. The
> aim here is to initiate a discussion that can lead to a robust SBI
> specification.

 very cool, atish.

 i would very much like to see the optional addition of multiple
serial lines, by adding a getchar and putchar function that takes just
one extra argument: the serial line index.

 there are a lot of different uses to which mult-serial lines may be put:

 * boot message separation from console login
 * boot management separation from other purposes (u-boot/coreboot)
 * virtual /dev/ttyS0-3
 * clean UPS reporting and management
 * remote virtual machine power management (power-on / off)
 * simple bog-standard multiple virtual login consoles
 * separation of debug messages (stdout/stderr) to ease debugging and
development
 * remote and virtual OpenOCD and kernel debugging without disrupting
the main serial console
 * PPP serial links.

this latter is one that i am particularly interested in, as i would
like to be able to boot a full GNU/Linux OS on spike, given the lower
barrier to entry in making modifications and experimenting with spike
than it is with qemu.

 if spike were able, through a multi-serial SBI interface, to have a
PPP serial line, it would be possible to run a root NFS (or other
network block device) without having to sacrifice console access.  it
would be possible to create an initramfs from a lower-capability
system like buildroot, containing PPP, enable it, and pivot-root out
to a full stock GNU/Linux OS such as debian or fedora.

 so there are huge benefits, reducing the development barrier to entry
into RISC-V experimentation and debugging, and opening up a much wider
range of capabilities and possibilities for machine and virtual system
management.

l.

WARNING: multiple messages have this Message-ID (diff)
From: Luke Kenneth Casson Leighton <lkcl@lkcl.net>
To: atish.patra@wdc.com
Cc: mark.rutland@arm.com, hch@infradead.org, Damien.LeMoal@wdc.com,
	olof.johansson@gmail.com, alankao@andestech.com,
	abner.chang@hpe.com, Anup Patel <anup@brainfault.org>,
	Palmer Dabbelt <palmer@sifive.com>,
	agraf@suse.de, zong@andestech.com, Alistair.Francis@wdc.com,
	paul.walmsley@sifive.com, mick@ics.forth.gr,
	sw-dev@groups.riscv.org, linux-riscv@lists.infradead.org,
	Andrew Waterman <andrew@sifive.com>
Subject: Re: [sw-dev] SBI extension proposal v2
Date: Sat, 10 Nov 2018 05:12:39 +0000	[thread overview]
Message-ID: <CAPweEDySAg6LCTNOKHB2Ax3tJNySi9XQzG4d1msSQQepwDi8Vw@mail.gmail.com> (raw)
Message-ID: <20181110051239.d0OP7FmBi8IHDYa5zKSW-96ChCuoLVR7jdityDugebo@z> (raw)
In-Reply-To: <4aef7216-726c-f565-5c0f-cebd2aefb46d@wdc.com>

On Sat, Nov 10, 2018 at 2:42 AM Atish Patra <atish.patra@wdc.com> wrote:

> ## Conclusion
> This proposal is far from perfect and absolutely any suggestion is
> welcome. Obviously, there are many other functionalities that can be
> added to this proposal. However, I just wanted to start with something
> that is an incremental change at best to kick off the discussion. The
> aim here is to initiate a discussion that can lead to a robust SBI
> specification.

 very cool, atish.

 i would very much like to see the optional addition of multiple
serial lines, by adding a getchar and putchar function that takes just
one extra argument: the serial line index.

 there are a lot of different uses to which mult-serial lines may be put:

 * boot message separation from console login
 * boot management separation from other purposes (u-boot/coreboot)
 * virtual /dev/ttyS0-3
 * clean UPS reporting and management
 * remote virtual machine power management (power-on / off)
 * simple bog-standard multiple virtual login consoles
 * separation of debug messages (stdout/stderr) to ease debugging and
development
 * remote and virtual OpenOCD and kernel debugging without disrupting
the main serial console
 * PPP serial links.

this latter is one that i am particularly interested in, as i would
like to be able to boot a full GNU/Linux OS on spike, given the lower
barrier to entry in making modifications and experimenting with spike
than it is with qemu.

 if spike were able, through a multi-serial SBI interface, to have a
PPP serial line, it would be possible to run a root NFS (or other
network block device) without having to sacrifice console access.  it
would be possible to create an initramfs from a lower-capability
system like buildroot, containing PPP, enable it, and pivot-root out
to a full stock GNU/Linux OS such as debian or fedora.

 so there are huge benefits, reducing the development barrier to entry
into RISC-V experimentation and debugging, and opening up a much wider
range of capabilities and possibilities for machine and virtual system
management.

l.

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  parent reply	other threads:[~2018-11-10  5:12 UTC|newest]

Thread overview: 100+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-11-10  2:42 SBI extension proposal v2 Atish Patra
2018-11-10  2:42 ` Atish Patra
2018-11-10  5:12 ` Luke Kenneth Casson Leighton [this message]
2018-11-10  5:12   ` [sw-dev] " Luke Kenneth Casson Leighton
2018-11-10 14:50   ` Nick Kossifidis
2018-11-10 14:50     ` Nick Kossifidis
2018-11-10 15:48     ` Luke Kenneth Casson Leighton
2018-11-10 15:48       ` Luke Kenneth Casson Leighton
2018-11-10 16:46       ` ron minnich
2018-11-10 16:46         ` ron minnich
2018-11-10 17:40         ` Luke Kenneth Casson Leighton
2018-11-10 17:40           ` Luke Kenneth Casson Leighton
2018-11-10 17:41         ` Samuel Falvo II
2018-11-10 17:41           ` Samuel Falvo II
2018-11-10 17:42           ` Luke Kenneth Casson Leighton
2018-11-10 17:42             ` Luke Kenneth Casson Leighton
2018-11-10 17:51             ` Samuel Falvo II
2018-11-10 17:51               ` Samuel Falvo II
2018-11-10 17:55               ` Luke Kenneth Casson Leighton
2018-11-10 17:55                 ` Luke Kenneth Casson Leighton
2018-11-10 18:03                 ` Samuel Falvo II
2018-11-10 18:03                   ` Samuel Falvo II
2018-11-10 17:43           ` Samuel Falvo II
2018-11-10 17:43             ` Samuel Falvo II
2018-11-10 17:41         ` Olof Johansson
2018-11-10 17:41           ` Olof Johansson
2018-11-10 17:47           ` Luke Kenneth Casson Leighton
2018-11-10 17:47             ` Luke Kenneth Casson Leighton
2018-11-10 17:59             ` Nick Kossifidis
2018-11-10 17:59               ` Nick Kossifidis
2018-11-10 18:01               ` ron minnich
2018-11-10 18:01                 ` ron minnich
2018-11-10 19:33                 ` Luke Kenneth Casson Leighton
2018-11-10 19:33                   ` Luke Kenneth Casson Leighton
2018-11-10 19:39               ` Luke Kenneth Casson Leighton
2018-11-10 19:39                 ` Luke Kenneth Casson Leighton
2018-11-11  3:15                 ` Nick Kossifidis
2018-11-11  3:15                   ` Nick Kossifidis
2018-11-11  7:14                   ` Luke Kenneth Casson Leighton
2018-11-11  7:14                     ` Luke Kenneth Casson Leighton
2018-11-11 13:17                     ` Nick Kossifidis
2018-11-11 13:17                       ` Nick Kossifidis
2018-11-12  2:08                     ` Palmer Dabbelt
2018-11-12  2:08                       ` Palmer Dabbelt
2018-11-10 18:02             ` Olof Johansson
2018-11-10 18:02               ` Olof Johansson
2018-11-10 19:34               ` Luke Kenneth Casson Leighton
2018-11-10 19:34                 ` Luke Kenneth Casson Leighton
2018-11-13  1:22             ` Michael Clark
2018-11-13  1:22               ` Michael Clark
2018-11-10 17:54           ` Nick Kossifidis
2018-11-10 17:54             ` Nick Kossifidis
2018-11-10 17:59           ` ron minnich
2018-11-10 17:59             ` ron minnich
2018-11-11  3:58         ` Atish Patra
2018-11-11  3:58           ` Atish Patra
2018-12-02  6:18           ` Benjamin Herrenschmidt
2019-01-28 12:31             ` Alexander Graf
2019-01-28 16:33               ` Luke Kenneth Casson Leighton
2019-01-28 16:38                 ` Alexander Graf
2019-01-28 16:47                   ` Nick Kossifidis
2019-01-28 19:43                     ` Alexander Graf
2019-01-28 19:47                       ` Atish Patra
2019-01-28 19:48                         ` Alexander Graf
2019-01-28 19:40                   ` ron minnich
2019-01-28 19:55                     ` Alexander Graf
2019-01-28 20:18                       ` ron minnich
2019-01-28 20:37                         ` Alexander Graf
2019-01-28 22:23                           ` ron minnich
2019-01-29  8:53                             ` Alexander Graf
2019-01-29 15:52                               ` ron minnich
2019-01-28 23:46                         ` Luke Kenneth Casson Leighton
2019-01-28 23:22                     ` Bruce Hoult
2019-01-29  0:03                       ` Luke Kenneth Casson Leighton
2019-01-29  4:28                       ` ron minnich
     [not found]                         ` <CANs6eMk4z-ZibLW_5o03onu8AQe23uMa2hSieceHFqKS7igLDQ@mail.gmail.com>
2019-01-30  0:05                           ` Luke Kenneth Casson Leighton
2019-01-30  0:17                             ` ron minnich
2019-01-30  0:49                             ` Bruce Hoult
2019-01-30  3:15                               ` Luke Kenneth Casson Leighton
     [not found]                     ` <09bede45-6ecf-4ded-8615-0be38aac33fc@groups.riscv.org>
2019-01-29  3:58                       ` Samuel Falvo II
2019-01-29  4:33                       ` ron minnich
2019-02-05 22:29                     ` Benjamin Herrenschmidt
2019-02-05 23:02                       ` Luís Marques
2019-02-06  7:03                         ` ron minnich
2019-02-06  7:54                           ` Damien Le Moal
2019-02-07  3:56                           ` Paul Walmsley
2019-02-07  7:17                             ` Anup Patel
2019-02-07  7:19                             ` Anup Patel
2019-01-29 22:41             ` Palmer Dabbelt
2018-11-10 17:43       ` Nick Kossifidis
2018-11-10 17:43         ` Nick Kossifidis
2018-11-10 17:51         ` Luke Kenneth Casson Leighton
2018-11-10 17:51           ` Luke Kenneth Casson Leighton
2018-11-10  5:36 ` David Abdurachmanov
2018-11-10  5:36   ` David Abdurachmanov
     [not found]   ` <CA++6G0BTdybjhqaXm9EhAz0HsgpwfozK6OEL7DuzbS48RbEChA@mail.gmail.com>
2018-11-10 15:09     ` Nick Kossifidis
2018-11-10 15:09       ` Nick Kossifidis
2018-11-12  4:33 ` Nick Kossifidis
2018-11-12  4:33   ` Nick Kossifidis
2018-12-04 23:22   ` [sw-dev] " Atish Patra

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