From: Christoph Hellwig <hch@lst.de>
To: Troy Benjegerdes <troy.benjegerdes@sifive.com>
Cc: Christoph Hellwig <hch@lst.de>,
Palmer Dabbelt <palmer@sifive.com>,
Paul Walmsley <paul.walmsley@sifive.com>,
Damien Le Moal <damien.lemoal@wdc.com>,
linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 15/15] riscv: disable the EFI PECOFF header for M-mode
Date: Wed, 21 Aug 2019 09:12:04 +0200 [thread overview]
Message-ID: <20190821071204.GA25836@lst.de> (raw)
In-Reply-To: <3BF39A0F-558D-40E0-880D-27829486F9F0@sifive.com>
On Tue, Aug 20, 2019 at 09:14:41PM -0700, Troy Benjegerdes wrote:
>
>
> > On Aug 13, 2019, at 8:47 AM, Christoph Hellwig <hch@lst.de> wrote:
> >
> > No point in bloating the kernel image with a bootloader header if
> > we run bare metal.
>
> I would say the same for S-mode. EFI booting should be an option, not
> a requirement. I have M-mode U-boot working with bootelf to start BBL,
> and at some point, I’m hoping we can have a M-mode linux kernel be
> the SBI provider for S-mode kernels, which seem most logical to me
> to start using the vmlinux elf binaries using something like kexec()
Strictly speaking we could just add another option for the header so
that you could also disable it for S-mode. But then again the header
is not very harmful, as you don't have to use it. It just eats up
a little more kernel space. And as that aspace is very tight for my
M-mode target (the Kendryte KD210) and it is totally pointless for
M-mode I just remove it there.
The idea of using M-mode Linux as the SBI sounds cool.
WARNING: multiple messages have this Message-ID (diff)
From: Christoph Hellwig <hch@lst.de>
To: Troy Benjegerdes <troy.benjegerdes@sifive.com>
Cc: Damien Le Moal <damien.lemoal@wdc.com>,
Palmer Dabbelt <palmer@sifive.com>,
linux-kernel@vger.kernel.org,
Paul Walmsley <paul.walmsley@sifive.com>,
linux-riscv@lists.infradead.org, Christoph Hellwig <hch@lst.de>
Subject: Re: [PATCH 15/15] riscv: disable the EFI PECOFF header for M-mode
Date: Wed, 21 Aug 2019 09:12:04 +0200 [thread overview]
Message-ID: <20190821071204.GA25836@lst.de> (raw)
In-Reply-To: <3BF39A0F-558D-40E0-880D-27829486F9F0@sifive.com>
On Tue, Aug 20, 2019 at 09:14:41PM -0700, Troy Benjegerdes wrote:
>
>
> > On Aug 13, 2019, at 8:47 AM, Christoph Hellwig <hch@lst.de> wrote:
> >
> > No point in bloating the kernel image with a bootloader header if
> > we run bare metal.
>
> I would say the same for S-mode. EFI booting should be an option, not
> a requirement. I have M-mode U-boot working with bootelf to start BBL,
> and at some point, I’m hoping we can have a M-mode linux kernel be
> the SBI provider for S-mode kernels, which seem most logical to me
> to start using the vmlinux elf binaries using something like kexec()
Strictly speaking we could just add another option for the header so
that you could also disable it for S-mode. But then again the header
is not very harmful, as you don't have to use it. It just eats up
a little more kernel space. And as that aspace is very tight for my
M-mode target (the Kendryte KD210) and it is totally pointless for
M-mode I just remove it there.
The idea of using M-mode Linux as the SBI sounds cool.
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next prev parent reply other threads:[~2019-08-21 7:12 UTC|newest]
Thread overview: 94+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-13 15:47 RISC-V nommu support v3 Christoph Hellwig
2019-08-13 15:47 ` Christoph Hellwig
2019-08-13 15:47 ` [PATCH 01/15] irqchip/sifive-plic: set max threshold for ignored handlers Christoph Hellwig
2019-08-13 15:47 ` Christoph Hellwig
2019-08-13 17:44 ` Paul Walmsley
2019-08-13 17:44 ` Paul Walmsley
2019-08-14 9:06 ` Marc Zyngier
2019-08-14 9:06 ` Marc Zyngier
2019-08-13 15:47 ` [PATCH 02/15] riscv: use CSR_SATP instead of the legacy sptbr name in switch_mm Christoph Hellwig
2019-08-13 15:47 ` Christoph Hellwig
2019-08-13 16:36 ` Paul Walmsley
2019-08-13 16:36 ` Paul Walmsley
2019-08-13 16:42 ` Christoph Hellwig
2019-08-13 16:42 ` Christoph Hellwig
2019-08-13 16:51 ` Paul Walmsley
2019-08-13 16:51 ` Paul Walmsley
2019-08-13 19:44 ` Paul Walmsley
2019-08-13 19:44 ` Paul Walmsley
2019-08-13 15:47 ` [PATCH 03/15] riscv: refactor the IPI code Christoph Hellwig
2019-08-13 15:47 ` Christoph Hellwig
2019-08-14 4:41 ` Paul Walmsley
2019-08-14 4:41 ` Paul Walmsley
2019-08-19 10:18 ` Christoph Hellwig
2019-08-19 10:18 ` Christoph Hellwig
2019-09-01 8:03 ` Christoph Hellwig
2019-09-01 8:03 ` Christoph Hellwig
2019-08-13 15:47 ` [PATCH 04/15] riscv: abstract out CSR names for supervisor vs machine mode Christoph Hellwig
2019-08-13 15:47 ` Christoph Hellwig
2019-08-13 15:47 ` [PATCH 05/15] riscv: improve the default power off implementation Christoph Hellwig
2019-08-13 15:47 ` Christoph Hellwig
2019-08-13 15:47 ` [PATCH 06/15] riscv: provide a flat entry loader Christoph Hellwig
2019-08-13 15:47 ` Christoph Hellwig
2019-08-13 15:47 ` [PATCH 07/15] riscv: read the hart ID from mhartid on boot Christoph Hellwig
2019-08-13 15:47 ` Christoph Hellwig
2019-08-13 15:47 ` [PATCH 08/15] riscv: provide native clint access for M-mode Christoph Hellwig
2019-08-13 15:47 ` Christoph Hellwig
2019-08-13 16:29 ` Mark Rutland
2019-08-13 16:29 ` Mark Rutland
2019-08-19 10:16 ` Christoph Hellwig
2019-08-19 10:16 ` Christoph Hellwig
2019-08-27 23:37 ` Palmer Dabbelt
2019-08-27 23:37 ` Palmer Dabbelt
2019-08-28 6:11 ` Christoph Hellwig
2019-08-28 6:11 ` Christoph Hellwig
2019-09-03 18:48 ` Palmer Dabbelt
2019-09-03 18:48 ` Palmer Dabbelt
2019-09-04 2:05 ` Alan Kao
2019-09-04 2:05 ` Alan Kao
2019-08-21 0:24 ` Atish Patra
2019-08-21 0:24 ` Atish Patra
2019-08-21 0:42 ` hch
2019-08-21 0:42 ` hch
2019-08-13 15:47 ` [PATCH 09/15] riscv: implement remote sfence.i natively " Christoph Hellwig
2019-08-13 15:47 ` Christoph Hellwig
2019-08-20 21:04 ` Atish Patra
2019-08-20 21:04 ` Atish Patra
2019-08-13 15:47 ` [PATCH 10/15] riscv: poison SBI calls " Christoph Hellwig
2019-08-13 15:47 ` Christoph Hellwig
2019-08-20 21:05 ` Atish Patra
2019-08-20 21:05 ` Atish Patra
2019-08-13 15:47 ` [PATCH 11/15] riscv: don't allow selecting SBI-based drivers " Christoph Hellwig
2019-08-13 15:47 ` Christoph Hellwig
2019-08-13 15:47 ` [PATCH 12/15] riscv: use the correct interrupt levels " Christoph Hellwig
2019-08-13 15:47 ` Christoph Hellwig
2019-08-13 15:47 ` [PATCH 13/15] riscv: clear the instruction cache and all registers when booting Christoph Hellwig
2019-08-13 15:47 ` Christoph Hellwig
2019-08-14 1:00 ` Alan Kao
2019-08-14 1:00 ` Alan Kao
2019-08-14 1:07 ` Alan Kao
2019-08-14 1:07 ` Alan Kao
2019-08-14 4:35 ` Christoph Hellwig
2019-08-14 4:35 ` Christoph Hellwig
2019-08-13 15:47 ` [PATCH 14/15] riscv: add nommu support Christoph Hellwig
2019-08-13 15:47 ` Christoph Hellwig
2019-08-13 15:47 ` [PATCH 15/15] riscv: disable the EFI PECOFF header for M-mode Christoph Hellwig
2019-08-13 15:47 ` Christoph Hellwig
2019-08-20 21:07 ` Atish Patra
2019-08-20 21:07 ` Atish Patra
2019-08-21 4:14 ` Troy Benjegerdes
2019-08-21 4:14 ` Troy Benjegerdes
2019-08-21 7:12 ` Christoph Hellwig [this message]
2019-08-21 7:12 ` Christoph Hellwig
2019-08-21 17:31 ` Atish Patra
2019-08-21 17:31 ` Atish Patra
2019-08-21 17:54 ` Troy Benjegerdes
2019-08-21 17:54 ` Troy Benjegerdes
2019-08-21 23:02 ` Anup Patel
2019-08-21 23:02 ` Anup Patel
2019-08-21 23:32 ` Troy Benjegerdes
2019-08-21 23:32 ` Troy Benjegerdes
2019-10-17 17:37 RISC-V nommu support v5 Christoph Hellwig
2019-10-17 17:37 ` [PATCH 15/15] riscv: disable the EFI PECOFF header for M-mode Christoph Hellwig
2019-10-17 17:37 ` Christoph Hellwig
2019-10-18 3:06 ` Anup Patel
2019-10-18 3:06 ` Anup Patel
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