From eugen@grosbein.net Thu Aug 11 07:22:23 2022 X-Original-To: dev-commits-src-all@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 4M3JDK0t6dz4Y4Lt; Thu, 11 Aug 2022 07:22:41 +0000 (UTC) (envelope-from eugen@grosbein.net) Received: from hz.grosbein.net (hz.grosbein.net [IPv6:2a01:4f8:c2c:26d8::2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "hz.grosbein.net", Issuer "hz.grosbein.net" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id 4M3JDH6n1hz3QgM; Thu, 11 Aug 2022 07:22:39 +0000 (UTC) (envelope-from eugen@grosbein.net) Received: from eg.sd.rdtc.ru (root@eg.sd.rdtc.ru [62.231.161.221] (may be forged)) by hz.grosbein.net (8.16.1/8.16.1) with ESMTPS id 27B7MUNP091313 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 11 Aug 2022 07:22:31 GMT (envelope-from eugen@grosbein.net) X-Envelope-From: eugen@grosbein.net X-Envelope-To: imp@FreeBSD.org Received: from [10.58.0.11] (dadvw [10.58.0.11] (may be forged)) by eg.sd.rdtc.ru (8.16.1/8.16.1) with ESMTPS id 27B7MUOC088970 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT); Thu, 11 Aug 2022 14:22:30 +0700 (+07) (envelope-from eugen@grosbein.net) Subject: Re: git: 39fdad34e220 - main - stand: impose 510,000 byte limit for /boot/loader and /boot/pxeldr To: Warner Losh , src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org References: <202208110331.27B3Va7M007335@gitrepo.freebsd.org> From: Eugene Grosbein Message-ID: <60350f27-b04f-7eda-ac05-95db6b8e168f@grosbein.net> Date: Thu, 11 Aug 2022 14:22:23 +0700 User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.8.0 List-Id: Commit messages for all branches of the src repository List-Archive: https://lists.freebsd.org/archives/dev-commits-src-all List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-dev-commits-src-all@freebsd.org X-BeenThere: dev-commits-src-all@freebsd.org MIME-Version: 1.0 In-Reply-To: <202208110331.27B3Va7M007335@gitrepo.freebsd.org> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-Spam-Status: No, score=-1.0 required=5.0 tests=ALL_TRUSTED,SHORTCIRCUIT autolearn=disabled version=3.4.2 X-Spam-Report: * -0.0 SHORTCIRCUIT No description available. * -1.0 ALL_TRUSTED Passed through trusted hosts only via SMTP X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on hz.grosbein.net X-Rspamd-Queue-Id: 4M3JDH6n1hz3QgM X-Spamd-Bar: -- Authentication-Results: mx1.freebsd.org; dkim=none; dmarc=none; spf=fail (mx1.freebsd.org: domain of eugen@grosbein.net does not designate 2a01:4f8:c2c:26d8::2 as permitted sender) smtp.mailfrom=eugen@grosbein.net X-Spamd-Result: default: False [-2.10 / 15.00]; NEURAL_HAM_LONG(-1.00)[-1.000]; R_SPF_FAIL(1.00)[-all]; NEURAL_HAM_MEDIUM(-1.00)[-1.000]; NEURAL_HAM_SHORT(-1.00)[-1.000]; MIME_GOOD(-0.10)[text/plain]; MLMMJ_DEST(0.00)[dev-commits-src-main@FreeBSD.org,dev-commits-src-all@FreeBSD.org]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+]; R_DKIM_NA(0.00)[]; ASN(0.00)[asn:24940, ipnet:2a01:4f8::/32, country:DE]; RCVD_COUNT_THREE(0.00)[3]; ARC_NA(0.00)[]; RCVD_TLS_ALL(0.00)[]; FROM_HAS_DN(0.00)[]; FREEFALL_USER(0.00)[eugen]; TO_DN_SOME(0.00)[]; RCPT_COUNT_THREE(0.00)[4]; DMARC_NA(0.00)[grosbein.net]; TO_MATCH_ENVRCPT_ALL(0.00)[]; MID_RHS_MATCH_FROM(0.00)[] X-ThisMailContainsUnwantedMimeParts: N 11.08.2022 10:31, Warner Losh wrote: > At this late date, it likely isn't worth the efforts to move parts of > the loader into high memory. There's a number of assumptions about where > the stack is, where buffers reside, etc that are fulfilled when it lives > in the first 640k that would need bounce buffers and/or other counter > measures if we were to split it up. All BIOS calls are done in 16-bit > mode with SEG:OFF addresses, requiring them to be in the first 640k of > RAM. And nearly all machines in the last decade can boot with UEFI > (though there's some exceptions, so it isn't worth killing outright > yet). Also, there is still working hardware (32bit-only even) that pre-dates 10 years margin like some PC104 platforms with BIOS-only boot and great FreeBSD support. For example, based on AMD Geode that runs FreeBSD 12.3-STABLE/i386 just fine.