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From: Ahmad Fatoum <a.fatoum@pengutronix.de>
To: Antony Pavlov <antonynpavlov@gmail.com>,
	Oleksij Rempel <o.rempel@pengutronix.de>,
	Michael Grzeschik <mgr@pengutronix.de>
Cc: barebox@lists.infradead.org
Subject: Re: MIPS RELOCATABLE: [PATCH 14/20] RISC-V: erizo: migrate to PBL
Date: Mon, 15 Mar 2021 16:46:25 +0100	[thread overview]
Message-ID: <14b14f6b-a8ae-1b8b-c06a-73d909a4a9f7@pengutronix.de> (raw)
In-Reply-To: <20210315183737.22015972e2e058b32f21447c@gmail.com>

Hi,

On 15.03.21 16:37, Antony Pavlov wrote:
> On Mon, 15 Mar 2021 13:40:10 +0100
> Ahmad Fatoum <a.fatoum@pengutronix.de> wrote:
>> Without having dug into the MIPS code, the main point of CONFIG_RELOCATABLE
>> is that PBL can check for it to decide where to copy barebox proper to.
>>
>> This is very relevant if there's no TEXT_BASE that works for all boards
>> that you need to support with your multi-image barebox.
> 
> So CONFIG_RELOCATABLE can be very helpful.
> 
> At the moment MIPS barebox is always relocatable.
> Sometimes it's useful to run barebox from fixed TEXT_BASE (e.g. during gdb debug session),
> so this fixed TEXT_BASE behaviour can be introduced for CONFIG_RELOCATABLE=n case.

With the pbl break stuff, you could in theory already flip a config option
and have a gdb script that computes your load address from the address of
your breakpoint. That would be nice to have as a ready-to-use script.

I recall Oleksij and Michael did something in that regard.

Benefit is that the break is an actual machine code nop when inactive,
so binary size/layout shouldn't change, unlike with flipping CONFIG_RELOCATABLE.
For RISC-V, I see no good reason to allow CONFIG_RELOCATABLE=n right now.

Cheers,
Ahmad

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  reply	other threads:[~2021-03-15 15:47 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-14 12:27 [PATCH 00/20] RISC-V: rework for PBL, VIRT and 64-Bit support Ahmad Fatoum
2021-03-14 12:27 ` [PATCH 01/20] partitions: don't allocate dma capable memory Ahmad Fatoum
2021-03-14 12:27 ` [PATCH 02/20] images: make BOARD_ARM_GENERIC_DT available for other arches Ahmad Fatoum
2021-03-14 12:27 ` [PATCH 03/20] ARM: rename CONFIG_ARM_USE_COMPRESSED_DTB to CONFIG_USE_COMPRESSED_DTB Ahmad Fatoum
2021-03-14 12:27 ` [PATCH 04/20] ARM: aarch64: ommit unused label in assembly Ahmad Fatoum
2021-03-14 12:27 ` [PATCH 05/20] serial: virtio-console: depend on, but don't select VIRTIO Ahmad Fatoum
2021-03-14 12:27 ` [PATCH 06/20] filetype: detect RISC-V Linux kernel image Ahmad Fatoum
2021-03-14 12:27 ` [PATCH 07/20] asm: unaligned: don't do unaligned accesses Ahmad Fatoum
2021-03-14 12:27 ` [PATCH 08/20] RISC-V: debug_ll: ns16550: align C access size with assembly's Ahmad Fatoum
2021-03-14 12:27 ` [PATCH 09/20] RISC-V: drop duplicate or unneeded cflags Ahmad Fatoum
2021-03-14 12:27 ` [PATCH 10/20] RISC-V: add cacheless HAS_DMA support Ahmad Fatoum
2021-03-14 12:27 ` [PATCH 11/20] RISC-V: erizo: move to arch/riscv/boards/erizo Ahmad Fatoum
2021-03-14 12:27 ` [PATCH 12/20] RISC-V: import Linux' optimized string functions Ahmad Fatoum
2021-03-14 12:27 ` [PATCH 13/20] RISC-V: implement PBL and relocation support Ahmad Fatoum
2021-03-15  7:43   ` Ahmad Fatoum
2021-03-14 12:27 ` [PATCH 14/20] RISC-V: erizo: migrate to PBL Ahmad Fatoum
2021-03-15  8:43   ` MIPS RELOCATABLE: " Antony Pavlov
2021-03-15 11:45     ` Oleksij Rempel
2021-03-15 12:08       ` Antony Pavlov
2021-03-15 12:40         ` Ahmad Fatoum
2021-03-15 15:37           ` Antony Pavlov
2021-03-15 15:46             ` Ahmad Fatoum [this message]
2021-03-15 17:03               ` Oleksij Rempel
2021-03-14 12:27 ` [PATCH 15/20] RISC-V: support symbol names in barebox image Ahmad Fatoum
2021-03-14 12:28 ` [PATCH 16/20] RISC-V: add 64-bit support Ahmad Fatoum
2021-03-14 12:51   ` Rouven Czerwinski
2021-03-14 13:03   ` [PATCH 1/2] fixup! " Ahmad Fatoum
2021-03-14 13:03     ` [PATCH 2/2] " Ahmad Fatoum
2021-03-15  8:38       ` Antony Pavlov
2021-03-14 12:28 ` [PATCH 17/20] RISC-V: add generic DT image Ahmad Fatoum
2021-03-14 12:28 ` [PATCH 18/20] clocksource: add driver for RISC-V CLINT timer Ahmad Fatoum
2021-03-14 12:28 ` [PATCH 19/20] power: reset: add drivers for generic syscon reset and poweroff Ahmad Fatoum
2021-03-14 12:28 ` [PATCH 20/20] RISC-V: add Qemu virt support Ahmad Fatoum
2021-03-14 16:30   ` [PATCH] fixup! " Ahmad Fatoum
2021-03-15  8:22 ` [PATCH 00/20] RISC-V: rework for PBL, VIRT and 64-Bit support Antony Pavlov
2021-03-15 10:30   ` Ahmad Fatoum

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