[{"id":3676666,"web_url":"http://patchwork.ozlabs.org/comment/3676666/","msgid":"<2B283171-55E2-4DC1-9F5F-BE2254E8DB7D@gmail.com>","list_archive_url":null,"date":"2026-04-13T11:30:20","subject":"Re: [PATCH] hw/ppc/e500: fix bus-frequency property hardcoded to zero\n in CPU FDT node","submitter":{"id":83251,"url":"http://patchwork.ozlabs.org/api/people/83251/","name":"Bernhard Beschow","email":"shentey@gmail.com"},"content":"+ qemu-stable\n\nAm 11. April 2026 15:45:35 UTC schrieb Vivien LEGER :\n>The bus-frequency property in the CPU FDT node was hardcoded to 0.\n>This is incorrect - it should reflect the actual platform bus clock\n>frequency, as firmware and RTOSes use it to derive peripheral clock\n>rates.\n>\n>Notably, the RTEMS QorIQ BSP uses bus-frequency to program the MPIC\n>global timer interval. With bus-frequency=0, the timer interval\n>overflows to ~85 seconds, preventing any clock interrupts from firing.\n>\n>Fix by adding a bus_freq field to PPCE500MachineClass and using it in\n>the FDT generator. Set bus_freq = PLATFORM_CLK_FREQ_HZ (400MHz) for\n>existing machines, matching the existing clock_freq value.\n>\n>Signed-off-by: Vivien LEGER \n>---\n> hw/ppc/e500.c | 2 +-\n> hw/ppc/e500.h | 1 +\n> hw/ppc/e500plat.c | 1 +\n> hw/ppc/mpc8544ds.c | 1 +\n> 4 files changed, 4 insertions(+), 1 deletion(-)\n>\n>diff --git a/hw/ppc/e500.c b/hw/ppc/e500.c\n>index d6ca2e8..5be2f20 100644\n>--- a/hw/ppc/e500.c\n>+++ b/hw/ppc/e500.c\n>@@ -518,7 +518,7 @@ static int ppce500_load_device_tree(PPCE500MachineState *pms,\n> env->icache_line_size);\n> qemu_fdt_setprop_cell(fdt, cpu_name, \"d-cache-size\", 0x8000);\n> qemu_fdt_setprop_cell(fdt, cpu_name, \"i-cache-size\", 0x8000);\n>- qemu_fdt_setprop_cell(fdt, cpu_name, \"bus-frequency\", 0);\n>+ qemu_fdt_setprop_cell(fdt, cpu_name, \"bus-frequency\", pmc->bus_freq);\n> if (cpu->cpu_index) {\n> qemu_fdt_setprop_string(fdt, cpu_name, \"status\", \"disabled\");\n> qemu_fdt_setprop_string(fdt, cpu_name, \"enable-method\",\n>diff --git a/hw/ppc/e500.h b/hw/ppc/e500.h\n>index 11f8ae5..6d56c7b 100644\n>--- a/hw/ppc/e500.h\n>+++ b/hw/ppc/e500.h\n>@@ -40,6 +40,7 @@ struct PPCE500MachineClass {\n> hwaddr pci_mmio_bus_base;\n> hwaddr spin_base;\n> uint32_t clock_freq;\n>+ uint32_t bus_freq;\n> uint32_t tb_freq;\n> };\n> \n>diff --git a/hw/ppc/e500plat.c b/hw/ppc/e500plat.c\n>index ca56472..85cec81 100644\n>--- a/hw/ppc/e500plat.c\n>+++ b/hw/ppc/e500plat.c\n>@@ -94,6 +94,7 @@ static void e500plat_machine_class_init(ObjectClass *oc, const void *data)\n> pmc->pci_mmio_bus_base = 0xE0000000ULL;\n> pmc->spin_base = 0xFEF000000ULL;\n> pmc->clock_freq = PLATFORM_CLK_FREQ_HZ;\n>+ pmc->bus_freq = PLATFORM_CLK_FREQ_HZ;\n> pmc->tb_freq = PLATFORM_CLK_FREQ_HZ;\n> \n> mc->desc = \"generic paravirt e500 platform\";\n>diff --git a/hw/ppc/mpc8544ds.c b/hw/ppc/mpc8544ds.c\n>index 5826985..d022761 100644\n>--- a/hw/ppc/mpc8544ds.c\n>+++ b/hw/ppc/mpc8544ds.c\n>@@ -56,6 +56,7 @@ static void mpc8544ds_machine_class_init(ObjectClass *oc, const void *data)\n> pmc->pci_pio_base = 0xE1000000ULL;\n> pmc->spin_base = 0xEF000000ULL;\n> pmc->clock_freq = PLATFORM_CLK_FREQ_HZ;\n>+ pmc->bus_freq = PLATFORM_CLK_FREQ_HZ;\n> pmc->tb_freq = PLATFORM_CLK_FREQ_HZ;\n> \n> mc->desc = \"mpc8544ds\";\n\nReviewed-by: Bernhard Beschow ","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=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=JvX2GB1W;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; helo=lists1p.gnu.org;\n envelope-from=qemu-ppc-bounces+incoming=patchwork.ozlabs.org@nongnu.org;\n receiver=patchwork.ozlabs.org)"],"Received":["from lists1p.gnu.org (lists1p.gnu.org [209.51.188.17])\n\t(using TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits))\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4fvQFb0Knyz1xtJ\n\tfor ; Mon, 13 Apr 2026 21:30:41 +1000 (AEST)","from localhost ([::1] helo=lists1p.gnu.org)\n\tby lists1p.gnu.org with esmtp (Exim 4.90_1)\n\t(envelope-from )\n\tid 1wCFUu-0002xu-GH; Mon, 13 Apr 2026 07:30:32 -0400","from eggs.gnu.org ([2001:470:142:3::10])\n by lists1p.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256)\n (Exim 4.90_1) (envelope-from ) id 1wCFUr-0002wN-JH\n for qemu-ppc@nongnu.org; Mon, 13 Apr 2026 07:30:30 -0400","from mail-wm1-x336.google.com ([2a00:1450:4864:20::336])\n by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128)\n (Exim 4.90_1) (envelope-from ) id 1wCFUo-0001ks-Lr\n for qemu-ppc@nongnu.org; Mon, 13 Apr 2026 07:30:29 -0400","by mail-wm1-x336.google.com with SMTP id\n 5b1f17b1804b1-488a041eae5so31170615e9.1\n for ; Mon, 13 Apr 2026 04:30:24 -0700 (PDT)","from ehlo.thunderbird.net\n (p200300faaf1c6100004fcff454cbdf8f.dip0.t-ipconnect.de.\n [2003:fa:af1c:6100:4f:cff4:54cb:df8f])\n by smtp.gmail.com with ESMTPSA id\n 5b1f17b1804b1-488d531f2b6sm313844605e9.2.2026.04.13.04.30.22\n (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128);\n Mon, 13 Apr 2026 04:30:22 -0700 (PDT)"],"DKIM-Signature":"v=1; a=rsa-sha256; c=relaxed/relaxed;\n d=gmail.com; s=20251104; t=1776079824; x=1776684624; darn=nongnu.org;\n h=content-transfer-encoding:mime-version:message-id:references\n :in-reply-to:subject:cc:to:from:date:from:to:cc:subject:date\n :message-id:reply-to;\n bh=rWtG8WcHxf4Xxq57DLRbd8kXq4RAnv0N9QDkaJJ0gxs=;\n b=JvX2GB1WfVQDIiBwJqqTNLmg7CnqH6kMfUDhV5hPhXavSGXTP0kq6rUd6T1QdjFZ1q\n G02MUP/LTZ9bet5lLZepvzjVWykwX078RWwfJ/7wH7VktAwWyrLUtL11ov+UDi1JxqlE\n yyE5tJ0Dq9RH6YvRrq5nG6+tj0zRhTIBpkeHtz63H42GfY9XTdRZKTB5MLkPJdZnX1Q0\n UScRSTqVzPBQuWpTCqzQPxwa78WH4yLg4M5J2jTg4PWflTz5DnGfJ3HpEWpumhIQqspy\n zLyg+fFNSci8rlF4FMvoj8IQkFjpXJnL6GggOpvbkYC6d+LVq8VdnbjLm5BJw633vPOo\n 21Zg==","X-Google-DKIM-Signature":"v=1; a=rsa-sha256; c=relaxed/relaxed;\n d=1e100.net; s=20251104; t=1776079824; x=1776684624;\n h=content-transfer-encoding:mime-version:message-id:references\n :in-reply-to:subject:cc:to:from:date:x-gm-gg:x-gm-message-state:from\n :to:cc:subject:date:message-id:reply-to;\n bh=rWtG8WcHxf4Xxq57DLRbd8kXq4RAnv0N9QDkaJJ0gxs=;\n b=dBTkcjpxE6lEmXA7hSk366lkzGV1LGDSx4wIY/4utDx4FUnFOEnbzG4YbFL4YjoVGs\n 7MrfvDQUd9bMbv0Zz62Di9aweIukqpCL6GL8xfpWcbTWaf1VVGwz3Pl9igW2129/dGEm\n pg+31IxlWpp9FwNXoMH+YZW10iTw0/qlAmAuSE2/lxwDWtQKcl1V2wWMKKy+QLH61/14\n qB6BT4pdfGmFEPNse1ppT9hjgpx7BAQW5FchXoyNScWSqnWcMSpnL620qSax+mO1urYy\n GSHYS5lwTUJEmcwyk0pd8KIDZHTB6CDqvEYaz8QMUVCmrLXpuDLCamPxXfY9q5Bu4rom\n 6Gsw==","X-Forwarded-Encrypted":"i=1;\n AFNElJ8li2dMUqAakuKXYbjoVyduiwyiDTukWfig8+SFgfBO9fSy2KyqirTJuReB/w0HppwZacVv+9RNKA==@nongnu.org","X-Gm-Message-State":"AOJu0YyMhf6sPdvvDpWvRvnqGBc3W0eGs+LcjitALnecrHYIfjvJMDf5\n pz0+NsgId/r8lrlP3OsBfuD+Ipx9PT+GTHJHhSAvBhsmxlYe0vuN6N13","X-Gm-Gg":"AeBDiet/m+BQ8UAxTV75KmUV3fh99x9aQ2Smzhr+UE3ENyWLO6npP2LxgaumYhY78Sg\n VtL57JzRNI2OpaCzK7L62x88GLZ/uwUCrvKdXjY0MBWEXTajkmhhWhZvxg+RjYFzyEYkr8O5xIK\n 0bOYkFGVH+UGa/Oc6nGyi/CKe1wHw6Shtp9Hmypfc5udcduo7KbGH3xjGFCBriC+Ib9EXSFABha\n z9RSFdoCF2U6SOcJyARXzaMRzRonXNWl/5bMmQ8FOdJ/kBkQQ2yiz5aHE6LAMsJWVH6Iy1eGH2e\n ZLnQ1nOQP7Xoj32FhIg1vzSsLIB9nZYy2g4vIsQ16+kxj7eTT5s32y9Kf+WyO6GTUz45eYvno2M\n wR7SvBExO6IlSWEY7jyaY91poJd9lgoOM7a0nbOHduavD92XZhHSM3BiEiuYj/Mvgf//AQvMXYt\n /OvrMJqYi8Hqg2c4Bh7vgHt+q3VPPQrEblnyFYRRwoba+B1TkmlgPCkMUeBcHTvBNE5JkIj4tJQ\n TgLLQFEBkXF1SCKyFqG","X-Received":"by 2002:a05:600c:3546:b0:488:a82f:bbb0 with SMTP id\n 5b1f17b1804b1-488d6889a3fmr176825145e9.27.1776079823330;\n Mon, 13 Apr 2026 04:30:23 -0700 (PDT)","Date":"Mon, 13 Apr 2026 11:30:20 +0000","From":"Bernhard Beschow ","To":"Vivien LEGER , qemu-ppc@nongnu.org","CC":"qemu-devel@nongnu.org, qemu-stable@nongnu.org","Subject":"Re: [PATCH] hw/ppc/e500: fix bus-frequency property hardcoded to zero\n in CPU FDT node","In-Reply-To":"<20260411154535.1451361-1-vivien.leger@gmail.com>","References":"<20260411154535.1451361-1-vivien.leger@gmail.com>","Message-ID":"<2B283171-55E2-4DC1-9F5F-BE2254E8DB7D@gmail.com>","MIME-Version":"1.0","Content-Type":"text/plain;\n charset=utf-8","Content-Transfer-Encoding":"quoted-printable","Received-SPF":"pass client-ip=2a00:1450:4864:20::336;\n envelope-from=shentey@gmail.com; helo=mail-wm1-x336.google.com","X-Spam_score_int":"-20","X-Spam_score":"-2.1","X-Spam_bar":"--","X-Spam_report":"(-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1,\n DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001,\n RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001,\n SPF_PASS=-0.001 autolearn=unavailable autolearn_force=no","X-Spam_action":"no action","X-BeenThere":"qemu-ppc@nongnu.org","X-Mailman-Version":"2.1.29","Precedence":"list","List-Id":"","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"qemu-ppc-bounces+incoming=patchwork.ozlabs.org@nongnu.org","Sender":"qemu-ppc-bounces+incoming=patchwork.ozlabs.org@nongnu.org"}}]