[{"id":3682302,"web_url":"http://patchwork.ozlabs.org/comment/3682302/","msgid":"","list_archive_url":null,"date":"2026-04-23T17:26:02","subject":"Re: [PATCH v2 6/6] common: Add an option to relocate on ram top","submitter":{"id":74147,"url":"http://patchwork.ozlabs.org/api/people/74147/","name":"Ilias Apalodimas","email":"ilias.apalodimas@linaro.org"},"content":"On Thu, 23 Apr 2026 at 19:06, Michal Simek wrote:\n>\n>\n>\n> On 4/23/26 17:28, Ilias Apalodimas wrote:\n> > Hi Michal\n> >\n> >\n> >>> {\n> >>> debug(\"Monitor len: %08x\\n\", gd->mon_len);\n> >>> -#if CONFIG_VAL(SYS_MEM_TOP_HIDE)\n> >>> +\n> >>> + if (CONFIG_IS_ENABLED(RELOC_ADDR_TOP)) {\n> >>> + int bank;\n> >>> + phys_size_t total_size = 0;\n> >>> +\n> >>> + for (bank = 0; bank < CONFIG_NR_DRAM_BANKS; bank++) {\n> >>> + if (gd->ram_top <= gd->bi_dram[bank].start)\n> >>> + gd->ram_top = gd->bi_dram[bank].start +\n> >>> + gd->bi_dram[bank].size;\n> >>> + total_size += gd->bi_dram[bank].size;\n> >>\n> >> Here you have one problem. If the latest bank is defined with size = 0\n> >> then your code won't ignore it and just use it. I think you should check at\n> >> least that size is not zero.\n> >\n> > I don't think this checks belongs here. IIRC the only reason to do\n> > that is have some previous stage bootloader, or earlier u-boot code\n> > update the zero length with a valid region. We already do similar\n> > checks in fdt_fixup_memory_banks(). We should add similar ones to the\n> > dram_init_banksize() variants. Most of the board specific functions\n> > call fdtdec_setup_memory_banksize() anyway, which I plan to fix as\n> > well and get rid of board code that's not needed anymore.\n> >\n> >>\n> >> Obviously size needs to be big enough to fit u-boot itself.\n> >\n> > Yea that makes sense, I can add a check for this.\n> >\n> >>\n> >> And as I said this is one configuration. Versal Gen 2 code has by default\n> >> configuration that it stays in a bank where it runs.\n> >> board/amd/versal2/board.c: dram_init()\n> >>\n> >> Added by commit 3aebac5a759b (\"arm64: versal2: Populate DRAM banks before page\n> >> table size calculation\")\n> >> Focus on text variable.\n> >>\n> >> That's why I can imagine that above code can be extended by one more\n> >> configuration to stay inside bank where actually u-boot is now.\n> >\n> > With having the dram bank in an array we can go an extra step in the\n> > future and have a Kconfig option with an int, representing the array\n> > position of the bank we want to relocate. That should cover what you\n> > ask here?\n>\n> Position in an array won't help because we have generic configuration which can\n> run with different amount of MCs/banks and it is not practical to say which one\n> it is. That's why we use bank where u-boot runs before relocation.\n\nOk, then we'll need to add a Kconfig option for that o nce someone extends it.\n\n>\n> Another part which we were handling was actually also dealing with reserved\n> memory nodes. Did you test it? I mean configuration where you have more banks\n> and the last bank is all reserved. Then U-Boot shouldn't relocate to it. That's\n> what it is handled today too.\n\nApart from some xilinx boards calling get_mem_top() I am not aware of\nany core code handling this. The current patch only depends on what\ndram_init_banksize() does. But then I don't think dram_init_banksize()\nshould be responsible for parsing the reserved memory nodes and\nadjusting ram top, reloc addresses etc.\nWhat I can change in the patch though is call get_mem_top() instead of\nthe for loop that adjusts ram_top. That function already takes the\nreserved regions into account.\n\nThanks\n/Ilias\n\n> Thanks,\n> Michal","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=linaro.org header.i=@linaro.org header.a=rsa-sha256\n header.s=google header.b=t5/6dP8a;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.denx.de\n (client-ip=85.214.62.61; helo=phobos.denx.de;\n envelope-from=u-boot-bounces@lists.denx.de; receiver=patchwork.ozlabs.org)","phobos.denx.de;\n dmarc=pass (p=none dis=none) header.from=linaro.org","phobos.denx.de;\n spf=pass smtp.mailfrom=u-boot-bounces@lists.denx.de","phobos.denx.de;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=linaro.org header.i=@linaro.org header.b=\"t5/6dP8a\";\n\tdkim-atps=neutral","phobos.denx.de;\n dmarc=pass (p=none dis=none) header.from=linaro.org","phobos.denx.de;\n spf=pass smtp.mailfrom=ilias.apalodimas@linaro.org"],"Received":["from phobos.denx.de (phobos.denx.de [85.214.62.61])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange x25519)\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4g2wYK3VHMz1yHv\n\tfor ; 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Thu, 23 Apr 2026\n 10:26:38 -0700 (PDT)","MIME-Version":"1.0","References":"<20260416055948.130041-1-ilias.apalodimas@linaro.org>\n <20260416055948.130041-7-ilias.apalodimas@linaro.org>\n <9511039f-3c92-4b4f-b6fd-c13d48867d24@amd.com>\n \n ","In-Reply-To":"","From":"Ilias Apalodimas ","Date":"Thu, 23 Apr 2026 20:26:02 +0300","X-Gm-Features":"AQROBzCIEcS9ra3-md8l314u1vJlm7XSjqfagycAv5N1h5R8WtePPlNOxVrJVSQ","Message-ID":"\n ","Subject":"Re: [PATCH v2 6/6] common: Add an option to relocate on ram top","To":"Michal Simek ","Cc":"trini@konsulko.com, marek.vasut+renesas@mailbox.org, jonas@kwiboo.se,\n anshuld@ti.com, sjg@chromium.org, u-boot@lists.denx.de","Content-Type":"text/plain; charset=\"UTF-8\"","X-BeenThere":"u-boot@lists.denx.de","X-Mailman-Version":"2.1.39","Precedence":"list","List-Id":"U-Boot discussion ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"u-boot-bounces@lists.denx.de","Sender":"\"U-Boot\" ","X-Virus-Scanned":"clamav-milter 0.103.8 at phobos.denx.de","X-Virus-Status":"Clean"}},{"id":3682351,"web_url":"http://patchwork.ozlabs.org/comment/3682351/","msgid":"","list_archive_url":null,"date":"2026-04-23T15:28:56","subject":"Re: [PATCH v2 6/6] common: Add an option to relocate on ram top","submitter":{"id":74147,"url":"http://patchwork.ozlabs.org/api/people/74147/","name":"Ilias Apalodimas","email":"ilias.apalodimas@linaro.org"},"content":"Hi Michal\n\n\n> > {\n> > debug(\"Monitor len: %08x\\n\", gd->mon_len);\n> > -#if CONFIG_VAL(SYS_MEM_TOP_HIDE)\n> > +\n> > + if (CONFIG_IS_ENABLED(RELOC_ADDR_TOP)) {\n> > + int bank;\n> > + phys_size_t total_size = 0;\n> > +\n> > + for (bank = 0; bank < CONFIG_NR_DRAM_BANKS; bank++) {\n> > + if (gd->ram_top <= gd->bi_dram[bank].start)\n> > + gd->ram_top = gd->bi_dram[bank].start +\n> > + gd->bi_dram[bank].size;\n> > + total_size += gd->bi_dram[bank].size;\n>\n> Here you have one problem. If the latest bank is defined with size = 0\n> then your code won't ignore it and just use it. I think you should check at\n> least that size is not zero.\n\nI don't think this checks belongs here. IIRC the only reason to do\nthat is have some previous stage bootloader, or earlier u-boot code\nupdate the zero length with a valid region. We already do similar\nchecks in fdt_fixup_memory_banks(). We should add similar ones to the\ndram_init_banksize() variants. Most of the board specific functions\ncall fdtdec_setup_memory_banksize() anyway, which I plan to fix as\nwell and get rid of board code that's not needed anymore.\n\n>\n> Obviously size needs to be big enough to fit u-boot itself.\n\nYea that makes sense, I can add a check for this.\n\n>\n> And as I said this is one configuration. Versal Gen 2 code has by default\n> configuration that it stays in a bank where it runs.\n> board/amd/versal2/board.c: dram_init()\n>\n> Added by commit 3aebac5a759b (\"arm64: versal2: Populate DRAM banks before page\n> table size calculation\")\n> Focus on text variable.\n>\n> That's why I can imagine that above code can be extended by one more\n> configuration to stay inside bank where actually u-boot is now.\n\nWith having the dram bank in an array we can go an extra step in the\nfuture and have a Kconfig option with an int, representing the array\nposition of the bank we want to relocate. That should cover what you\nask here?\n\nThanks\n/Ilias\n>\n> Thanks,\n> Michal\n>\n>\n>\n>\n>\n>\n> Thanks,\n> Michal","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=linaro.org header.i=@linaro.org header.a=rsa-sha256\n header.s=google header.b=yG4eVm3t;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.denx.de\n (client-ip=85.214.62.61; helo=phobos.denx.de;\n envelope-from=u-boot-bounces@lists.denx.de; receiver=patchwork.ozlabs.org)","phobos.denx.de;\n dmarc=pass (p=none dis=none) header.from=linaro.org","phobos.denx.de;\n spf=pass smtp.mailfrom=u-boot-bounces@lists.denx.de","phobos.denx.de;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=linaro.org header.i=@linaro.org header.b=\"yG4eVm3t\";\n\tdkim-atps=neutral","phobos.denx.de;\n dmarc=pass (p=none dis=none) header.from=linaro.org","phobos.denx.de;\n spf=pass smtp.mailfrom=ilias.apalodimas@linaro.org"],"Received":["from phobos.denx.de (phobos.denx.de [85.214.62.61])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange x25519)\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4g30ss6WDBz1yHv\n\tfor ; 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