From: "Pali Rohár" <pali.rohar@gmail.com> To: Arnd Bergmann <arnd@arndb.de> Cc: "Tony Lindgren" <tony@atomide.com>, "Pavel Machek" <pavel@ucw.cz>, "Frank Rowand" <frowand.list@gmail.com>, "devicetree@vger.kernel.org" <devicetree@vger.kernel.org>, "Russell King - ARM Linux" <linux@arm.linux.org.uk>, "Laura Abbott" <lauraa@codeaurora.org>, "Grant Likely" <grant.likely@linaro.org>, "Rob Herring" <robherring2@gmail.com>, "Will Deacon" <will.deacon@arm.com>, "Ivaylo Dimitrov" <ivo.g.dimitrov.75@gmail.com>, "Sebastian Reichel" <sre@debian.org>, "Andreas Färber" <afaerber@suse.de>, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-omap@vger.kernel.org Subject: Re: [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux,atags" entry Date: Wed, 25 Nov 2015 23:00:59 +0100 [thread overview] Message-ID: <201511252300.59976@pali> (raw) In-Reply-To: <17689711.DsQsCiDFAN@wuerfel> [-- Attachment #1: Type: Text/Plain, Size: 1541 bytes --] On Wednesday 25 November 2015 22:51:00 Arnd Bergmann wrote: > On Wednesday 25 November 2015 22:44:28 Pali Rohár wrote: > > Arnd, my question about proper solution reminds... Proprietary > > bootloader which cannot be replaced (e.g. it is signed or do > > unknown magic) provides information to booted kernel via custom > > specific ATAGs fields. How userspace could properly read those > > custom information from bootloader? > > The typical solution for nonstandard bootloaders is to have a boot > wrapper like the one from > https://github.com/zonque/pxa-impedance-matcher that translates > whatever information we have at the bootloader level into DT > properties. > Ok. So there is no better solution. With some hacks we can use U-Boot as 3rd stage bootloader. But this is not useful for debugging or developing... Ideal "wrapper" solution would be to compile wrapper and linux zImage and then glue them together to one binary. Something like internal linux uncompress code which translate atags to dt. > As I understand, the reason we are not doing that here is that we > also have proprietary user space that we can't fix to look in a > different place, i.e. the interface is between the bootloader and > some user binary, not bootloader to kernel. > Yes, proprietary/closed applications are problems which we cannot fix (without rewriting them). New applications could use new "proper" interface. But without that interface we cannot do that. -- Pali Rohár pali.rohar@gmail.com [-- Attachment #2: This is a digitally signed message part. --] [-- Type: application/pgp-signature, Size: 198 bytes --]
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From: pali.rohar@gmail.com (Pali Rohár) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux, atags" entry Date: Wed, 25 Nov 2015 23:00:59 +0100 [thread overview] Message-ID: <201511252300.59976@pali> (raw) In-Reply-To: <17689711.DsQsCiDFAN@wuerfel> On Wednesday 25 November 2015 22:51:00 Arnd Bergmann wrote: > On Wednesday 25 November 2015 22:44:28 Pali Roh?r wrote: > > Arnd, my question about proper solution reminds... Proprietary > > bootloader which cannot be replaced (e.g. it is signed or do > > unknown magic) provides information to booted kernel via custom > > specific ATAGs fields. How userspace could properly read those > > custom information from bootloader? > > The typical solution for nonstandard bootloaders is to have a boot > wrapper like the one from > https://github.com/zonque/pxa-impedance-matcher that translates > whatever information we have at the bootloader level into DT > properties. > Ok. So there is no better solution. With some hacks we can use U-Boot as 3rd stage bootloader. But this is not useful for debugging or developing... Ideal "wrapper" solution would be to compile wrapper and linux zImage and then glue them together to one binary. Something like internal linux uncompress code which translate atags to dt. > As I understand, the reason we are not doing that here is that we > also have proprietary user space that we can't fix to look in a > different place, i.e. the interface is between the bootloader and > some user binary, not bootloader to kernel. > Yes, proprietary/closed applications are problems which we cannot fix (without rewriting them). New applications could use new "proper" interface. But without that interface we cannot do that. -- Pali Roh?r pali.rohar at gmail.com -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 198 bytes Desc: This is a digitally signed message part. URL: <http://lists.infradead.org/pipermail/linux-arm-kernel/attachments/20151125/e61df3a0/attachment.sig>
next prev parent reply other threads:[~2015-11-25 22:01 UTC|newest] Thread overview: 160+ messages / expand[flat|nested] mbox.gz Atom feed top 2015-07-06 20:26 [PATCH 0/5] ATAGs to DT patches Pali Rohár 2015-07-06 20:26 ` Pali Rohár 2015-07-06 20:26 ` [PATCH 1/5] arm: devtree: Set system_rev from DT "/revision" Pali Rohár 2015-07-06 20:26 ` Pali Rohár 2015-07-06 20:26 ` Pali Rohár 2015-12-24 19:02 ` Pali Rohár 2015-12-24 19:02 ` Pali Rohár 2015-12-24 19:02 ` Pali Rohár 2015-12-28 21:01 ` Frank Rowand 2015-12-28 21:01 ` Frank Rowand 2015-12-28 21:01 ` Frank Rowand 2015-12-28 22:27 ` Arnd Bergmann 2015-12-28 22:27 ` Arnd Bergmann 2015-12-28 22:27 ` Arnd Bergmann 2016-01-05 11:37 ` Pali Rohár 2016-01-05 11:37 ` Pali Rohár 2016-01-05 11:37 ` Pali Rohár 2016-01-05 11:37 ` Pali Rohár 2016-01-05 11:45 ` Arnd Bergmann 2016-01-05 11:45 ` Arnd Bergmann 2016-01-05 11:45 ` Arnd Bergmann 2016-02-05 18:15 ` [PATCH] ARM: RX51: Set system_rev from ATAGS Ivaylo Dimitrov 2016-02-05 18:15 ` Ivaylo Dimitrov 2016-02-08 20:48 ` Tony Lindgren 2016-02-08 20:48 ` Tony Lindgren 2016-02-08 21:10 ` Pali Rohár 2016-02-08 21:10 ` Pali Rohár 2016-02-09 16:17 ` Tony Lindgren 2016-02-09 16:17 ` Tony Lindgren 2016-02-10 18:23 ` [PATCH v1] " Ivaylo Dimitrov 2016-02-10 18:23 ` Ivaylo Dimitrov 2016-02-11 0:19 ` Tony Lindgren 2016-02-11 0:19 ` Tony Lindgren 2015-07-06 20:26 ` [PATCH 2/5] arm: boot: convert ATAG_REVISION to DT "/revision" entry Pali Rohár 2015-07-06 20:26 ` Pali Rohár 2015-07-06 20:26 ` Pali Rohár 2015-07-06 20:26 ` [PATCH 3/5] arm: atags: Fix declaration of function save_atags Pali Rohár 2015-07-06 20:26 ` Pali Rohár 2015-07-06 20:26 ` [PATCH 4/5] arm: devtree: Read ATAGs structure from DT "/chosen/linux,atags" entry Pali Rohár 2015-07-06 20:26 ` [PATCH 4/5] arm: devtree: Read ATAGs structure from DT "/chosen/linux, atags" entry Pali Rohár 2015-07-06 20:26 ` [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux,atags" entry Pali Rohár 2015-07-06 20:26 ` [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux, atags" entry Pali Rohár 2015-07-07 11:32 ` [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux,atags" entry Russell King - ARM Linux 2015-07-07 11:32 ` Russell King - ARM Linux 2015-07-07 11:58 ` Pali Rohár 2015-07-07 11:58 ` Pali Rohár 2015-07-13 13:19 ` Tony Lindgren 2015-07-13 13:19 ` Tony Lindgren 2015-10-12 20:16 ` Tony Lindgren 2015-10-12 20:16 ` Tony Lindgren 2015-10-12 20:25 ` Pali Rohár 2015-10-12 20:25 ` [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux, atags" entry Pali Rohár 2015-10-12 20:45 ` [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux,atags" entry Tony Lindgren 2015-10-12 20:45 ` Tony Lindgren 2015-10-13 14:37 ` Pali Rohár 2015-10-13 14:37 ` Pali Rohár 2015-11-05 11:40 ` Pali Rohár 2015-11-05 11:40 ` Pali Rohár 2015-11-05 16:17 ` Tony Lindgren 2015-11-05 16:17 ` Tony Lindgren 2015-11-12 1:10 ` Frank Rowand 2015-11-12 1:10 ` [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux, atags" entry Frank Rowand 2015-11-22 6:51 ` [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux,atags" entry Pavel Machek 2015-11-22 6:51 ` Pavel Machek 2015-11-23 14:45 ` Pali Rohár 2015-11-23 14:45 ` Pali Rohár 2015-11-23 14:45 ` Pali Rohár 2015-11-25 18:16 ` Tony Lindgren 2015-11-25 18:16 ` Tony Lindgren 2015-11-25 18:16 ` Tony Lindgren 2015-11-25 19:48 ` Arnd Bergmann 2015-11-25 19:48 ` [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux, atags" entry Arnd Bergmann 2015-11-25 21:03 ` [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux,atags" entry Tony Lindgren 2015-11-25 21:03 ` Tony Lindgren 2015-11-25 21:03 ` Tony Lindgren 2015-11-25 21:29 ` Arnd Bergmann 2015-11-25 21:29 ` [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux, atags" entry Arnd Bergmann 2015-11-25 21:44 ` [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux,atags" entry Pali Rohár 2015-11-25 21:44 ` [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux, atags" entry Pali Rohár 2015-11-25 21:44 ` [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux,atags" entry Pali Rohár 2015-11-25 21:51 ` Arnd Bergmann 2015-11-25 21:51 ` [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux, atags" entry Arnd Bergmann 2015-11-25 22:00 ` Pali Rohár [this message] 2015-11-25 22:00 ` Pali Rohár 2015-11-26 4:19 ` [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux,atags" entry Frank Rowand 2015-11-26 4:19 ` [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux, atags" entry Frank Rowand 2015-11-26 9:07 ` [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux,atags" entry Pali Rohár 2015-11-26 9:07 ` Pali Rohár 2015-11-26 20:39 ` Tony Lindgren 2015-11-26 20:39 ` Tony Lindgren 2015-11-26 20:39 ` Tony Lindgren 2015-11-26 21:12 ` Ivaylo Dimitrov 2015-11-26 21:12 ` Ivaylo Dimitrov 2015-11-27 8:38 ` Pali Rohár 2015-11-27 8:38 ` Pali Rohár 2015-11-27 8:44 ` Michael Trimarchi 2015-11-27 8:44 ` Michael Trimarchi 2015-11-27 8:44 ` Michael Trimarchi 2015-11-27 8:52 ` Michael Trimarchi 2015-11-27 8:52 ` Michael Trimarchi 2015-11-27 14:51 ` Tony Lindgren 2015-11-27 14:51 ` Tony Lindgren 2015-11-27 13:27 ` Russell King - ARM Linux 2015-11-27 13:27 ` Russell King - ARM Linux 2015-11-27 19:51 ` Russell King - ARM Linux 2015-11-27 19:51 ` Russell King - ARM Linux 2015-11-27 19:51 ` Russell King - ARM Linux 2015-11-27 21:06 ` Arnd Bergmann 2015-11-27 21:06 ` [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux, atags" entry Arnd Bergmann 2015-11-27 23:28 ` [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux,atags" entry Nicolas Pitre 2015-11-27 23:28 ` Nicolas Pitre 2015-11-27 23:28 ` Nicolas Pitre 2015-11-28 12:27 ` Arnd Bergmann 2015-11-28 12:27 ` [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux, atags" entry Arnd Bergmann 2015-11-28 12:27 ` [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux,atags" entry Arnd Bergmann 2015-11-28 12:54 ` Russell King - ARM Linux 2015-11-28 12:54 ` Russell King - ARM Linux 2015-11-28 12:54 ` Russell King - ARM Linux 2015-11-28 12:33 ` Russell King - ARM Linux 2015-11-28 12:33 ` Russell King - ARM Linux 2015-11-28 17:34 ` Nicolas Pitre 2015-11-28 17:34 ` Nicolas Pitre 2015-11-28 21:02 ` Frank Rowand 2015-11-28 21:02 ` [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux, atags" entry Frank Rowand 2015-11-28 21:02 ` [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux,atags" entry Frank Rowand 2015-11-29 18:09 ` Russell King - ARM Linux 2015-11-29 18:09 ` Russell King - ARM Linux 2015-11-29 18:09 ` Russell King - ARM Linux 2015-11-29 18:19 ` Pali Rohár 2015-11-29 18:19 ` [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux, atags" entry Pali Rohár 2015-11-29 23:13 ` [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux,atags" entry Russell King - ARM Linux 2015-11-29 23:13 ` Russell King - ARM Linux 2015-11-30 0:09 ` Nicolas Pitre 2015-11-30 0:09 ` Nicolas Pitre 2015-11-30 0:15 ` Pali Rohár 2015-11-30 0:15 ` [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux, atags" entry Pali Rohár 2015-11-30 0:15 ` [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux,atags" entry Pali Rohár 2015-11-30 15:23 ` Tony Lindgren 2015-11-30 15:23 ` Tony Lindgren 2015-11-30 15:23 ` Tony Lindgren 2015-11-30 15:39 ` Pali Rohár 2015-11-30 15:39 ` Pali Rohár 2015-11-30 15:39 ` Pali Rohár 2015-11-30 16:09 ` Nicolas Pitre 2015-11-30 16:09 ` Nicolas Pitre 2015-12-15 9:33 ` Pali Rohár 2015-12-15 9:33 ` Pali Rohár 2015-12-15 11:04 ` Arnd Bergmann 2015-12-15 11:04 ` [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux, atags" entry Arnd Bergmann 2015-12-15 12:20 ` [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux,atags" entry Russell King - ARM Linux 2015-12-15 12:20 ` Russell King - ARM Linux 2015-12-15 17:24 ` Nicolas Pitre 2015-12-15 17:24 ` Nicolas Pitre 2015-12-15 17:24 ` Nicolas Pitre 2015-12-23 14:54 ` Ivaylo Dimitrov 2015-12-23 14:54 ` Ivaylo Dimitrov 2015-11-28 4:06 ` [PATCH 0/5] ATAGs to DT patches Frank Rowand 2015-11-28 4:06 ` Frank Rowand 2015-11-28 5:55 ` Frank Rowand 2015-11-28 5:55 ` Frank Rowand
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