From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 50B77C3271E for ; Thu, 4 Jul 2024 14:02:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=AjkYEaNqBMGxTuj+brvwAOYKkBcqOoEBn6ZQQ/6vTxQ=; b=Pfw5hML1aaWTfD cONkIsmoOUo+S6MGazubFPZj30LHGjNzOFnNU4vhmYQJz7ibYHnMncTKiL/5P/eAQ1KxllpyaYZuJ asMkLjisy+OSvmWi2bjSQun/ajFJhVdprEdcKbC3KAlHmhovtJjQsWU0IfhzZs11KUTQbSiu2gKKv aoUm0aG1EMYaW/+KLjOn2JCXp0e4bchnsv5hE0jWewqP8pNd7Bs13UeezKI+4CRuYSQ7b73owb5fC UVSCEKbRZTDjIcXOT7SAM+Kw1qbeTVpRxj4T79nadwHwJL0Gis76vlgogJ0EToNmeNnNDLHFv0y7e s9fe5zBYT8NJThUopkEw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1sPN2I-0000000DMvJ-22nA; Thu, 04 Jul 2024 14:02:10 +0000 Received: from sin.source.kernel.org ([2604:1380:40e1:4800::1]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1sPN2E-0000000DMsJ-3DYT for linux-riscv@lists.infradead.org; Thu, 04 Jul 2024 14:02:08 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sin.source.kernel.org (Postfix) with ESMTP id 97532CE34D1; Thu, 4 Jul 2024 14:02:03 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id A046CC3277B; Thu, 4 Jul 2024 14:01:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1720101722; bh=BpgPLUkOxoys4/2xP23JGgah9GInBRwSP+wjBYdzIYU=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=Da1TNbJS4oyiLPxoe0do3ahhBFHdPpP/92cYYxhME/EhsT7pFCrqYou+Eyh/nuMMe nyJID5aPSXH1mdR1ktRtyf00c8ldMQfNTnaYX6yYKv6dCo6xJDY2CBiEx003hwn/VK a91aDKsZX4S1A2sv0OiiC24Q4fN1PuC9Hf5I0RDPwybLnQ0Fgcol5SPd6kYmrHnAc/ +I2EM8UMuvLFC6Qnawzvi0Gh1v/Rxsd1hGoOyyuP1ew/LWh/9UnHzYPv5n9/2m5L+t wVuGPl7ApYzdicxZLvMYN/U+8qEnNHzxG+ZlZ0haiT88cRiH/4V00Qw9eVCnnQZGqW ht67i//WLOCgw== Date: Thu, 4 Jul 2024 21:46:46 +0800 From: Jisheng Zhang To: Yixun Lan Cc: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Conor Dooley , Paul Walmsley , Palmer Dabbelt , Albert Ou , Daniel Lezcano , Thomas Gleixner , Samuel Holland , Anup Patel , Greg Kroah-Hartman , Jiri Slaby , Lubomir Rintel , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Yangyu Chen , Inochi Amaoto , linux-serial@vger.kernel.org, linux-riscv@lists.infradead.org, Meng Zhang Subject: Re: [PATCH v3 08/11] riscv: dts: add initial SpacemiT K1 SoC device tree Message-ID: References: <20240703-k1-01-basic-dt-v3-0-12f73b47461e@gentoo.org> <20240703-k1-01-basic-dt-v3-8-12f73b47461e@gentoo.org> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20240703-k1-01-basic-dt-v3-8-12f73b47461e@gentoo.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240704_070207_189734_DC5459D1 X-CRM114-Status: GOOD ( 23.89 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org On Wed, Jul 03, 2024 at 02:55:11PM +0000, Yixun Lan wrote: > From: Yangyu Chen > > Banana Pi BPI-F3 motherboard is powered by SpacemiT K1[1]. > > Key features: > - 4 cores per cluster, 2 clusters on chip > - UART IP is Intel XScale UART > > Some key considerations: > - ISA string is inferred from vendor documentation[2] > - Cluster topology is inferred from datasheet[1] and L2 in vendor dts[3] > - No coherent DMA on this board > Inferred by taking vendor ethernet and MMC drivers to the mainline > kernel. Without dma-noncoherent in soc node, the driver fails. > - No cache nodes now > The parameters from vendor dts are likely to be wrong. It has 512 > sets for a 32KiB L1 Cache. In this case, each set is 64B in size. > When the size of the cache line is 64B, it is a directly mapped > cache rather than a set-associative cache, the latter is commonly > used. Thus, I didn't use the parameters from vendor dts. > > Currently only support booting into console with only uart, other > features will be added soon later. > > Link: https://docs.banana-pi.org/en/BPI-F3/SpacemiT_K1_datasheet [1] > Link: https://developer.spacemit.com/#/documentation?token=BWbGwbx7liGW21kq9lucSA6Vnpb [2] > Link: https://gitee.com/bianbu-linux/linux-6.1/blob/bl-v1.0.y/arch/riscv/boot/dts/spacemit/k1-x.dtsi [3] > Signed-off-by: Yangyu Chen > Signed-off-by: Yixun Lan > --- > arch/riscv/boot/dts/spacemit/k1.dtsi | 376 +++++++++++++++++++++++++++++++++++ > 1 file changed, 376 insertions(+) > > diff --git a/arch/riscv/boot/dts/spacemit/k1.dtsi b/arch/riscv/boot/dts/spacemit/k1.dtsi > new file mode 100644 > index 0000000000000..a076e35855a2e > --- /dev/null > +++ b/arch/riscv/boot/dts/spacemit/k1.dtsi > @@ -0,0 +1,376 @@ > +// SPDX-License-Identifier: GPL-2.0 OR MIT > +/* > + * Copyright (C) 2024 Yangyu Chen > + */ > + > +/dts-v1/; > +/ { > + #address-cells = <2>; > + #size-cells = <2>; > + model = "SpacemiT K1"; > + compatible = "spacemit,k1"; > + > + aliases { > + serial0 = &uart0; > + serial1 = &uart2; > + serial2 = &uart3; > + serial3 = &uart4; > + serial4 = &uart5; > + serial5 = &uart6; > + serial6 = &uart7; > + serial7 = &uart8; > + serial8 = &uart9; > + }; > + > + cpus { > + #address-cells = <1>; > + #size-cells = <0>; > + timebase-frequency = <24000000>; > + > + cpu-map { > + cluster0 { > + core0 { > + cpu = <&cpu_0>; > + }; > + core1 { > + cpu = <&cpu_1>; > + }; > + core2 { > + cpu = <&cpu_2>; > + }; > + core3 { > + cpu = <&cpu_3>; > + }; > + }; > + > + cluster1 { > + core0 { > + cpu = <&cpu_4>; > + }; > + core1 { > + cpu = <&cpu_5>; > + }; > + core2 { > + cpu = <&cpu_6>; > + }; > + core3 { > + cpu = <&cpu_7>; > + }; > + }; > + }; > + > + cpu_0: cpu@0 { > + compatible = "spacemit,x60", "riscv"; > + device_type = "cpu"; > + reg = <0>; > + riscv,isa = "rv64imafdcv_zicbom_zicbop_zicboz_zicntr_zicond_zicsr_zifencei_zihintpause_zihpm_zfh_zba_zbb_zbc_zbs_zkt_zvfh_zvkt_sscofpmf_sstc_svinval_svnapot_svpbmt"; > + riscv,isa-base = "rv64i"; > + riscv,isa-extensions = "i", "m", "a", "f", "d", "c", "v", "zicbom", > + "zicbop", "zicboz", "zicntr", "zicond", "zicsr", > + "zifencei", "zihintpause", "zihpm", "zfh", "zba", > + "zbb", "zbc", "zbs", "zkt", "zvfh", "zvkt", > + "sscofpmf", "sstc", "svinval", "svnapot", "svpbmt"; > + riscv,cbom-block-size = <64>; > + riscv,cbop-block-size = <64>; > + riscv,cboz-block-size = <64>; > + mmu-type = "riscv,sv39"; > + > + cpu0_intc: interrupt-controller { > + compatible = "riscv,cpu-intc"; > + interrupt-controller; > + #interrupt-cells = <1>; > + }; > + }; > + > + cpu_1: cpu@1 { > + compatible = "spacemit,x60", "riscv"; > + device_type = "cpu"; > + reg = <1>; > + riscv,isa = "rv64imafdcv_zicbom_zicbop_zicboz_zicntr_zicond_zicsr_zifencei_zihintpause_zihpm_zfh_zba_zbb_zbc_zbs_zkt_zvfh_zvkt_sscofpmf_sstc_svinval_svnapot_svpbmt"; > + riscv,isa-base = "rv64i"; > + riscv,isa-extensions = "i", "m", "a", "f", "d", "c", "v", "zicbom", > + "zicbop", "zicboz", "zicntr", "zicond", "zicsr", > + "zifencei", "zihintpause", "zihpm", "zfh", "zba", > + "zbb", "zbc", "zbs", "zkt", "zvfh", "zvkt", > + "sscofpmf", "sstc", "svinval", "svnapot", "svpbmt"; > + riscv,cbom-block-size = <64>; > + riscv,cbop-block-size = <64>; > + riscv,cboz-block-size = <64>; > + mmu-type = "riscv,sv39"; > + > + cpu1_intc: interrupt-controller { > + compatible = "riscv,cpu-intc"; > + interrupt-controller; > + #interrupt-cells = <1>; > + }; > + }; > + > + cpu_2: cpu@2 { > + compatible = "spacemit,x60", "riscv"; > + device_type = "cpu"; > + reg = <2>; > + riscv,isa = "rv64imafdcv_zicbom_zicbop_zicboz_zicntr_zicond_zicsr_zifencei_zihintpause_zihpm_zfh_zba_zbb_zbc_zbs_zkt_zvfh_zvkt_sscofpmf_sstc_svinval_svnapot_svpbmt"; > + riscv,isa-base = "rv64i"; > + riscv,isa-extensions = "i", "m", "a", "f", "d", "c", "v", "zicbom", > + "zicbop", "zicboz", "zicntr", "zicond", "zicsr", > + "zifencei", "zihintpause", "zihpm", "zfh", "zba", > + "zbb", "zbc", "zbs", "zkt", "zvfh", "zvkt", > + "sscofpmf", "sstc", "svinval", "svnapot", "svpbmt"; > + riscv,cbom-block-size = <64>; > + riscv,cbop-block-size = <64>; > + riscv,cboz-block-size = <64>; > + mmu-type = "riscv,sv39"; > + > + cpu2_intc: interrupt-controller { > + compatible = "riscv,cpu-intc"; > + interrupt-controller; > + #interrupt-cells = <1>; > + }; > + }; > + > + cpu_3: cpu@3 { > + compatible = "spacemit,x60", "riscv"; > + device_type = "cpu"; > + reg = <3>; > + riscv,isa = "rv64imafdcv_zicbom_zicbop_zicboz_zicntr_zicond_zicsr_zifencei_zihintpause_zihpm_zfh_zba_zbb_zbc_zbs_zkt_zvfh_zvkt_sscofpmf_sstc_svinval_svnapot_svpbmt"; > + riscv,isa-base = "rv64i"; > + riscv,isa-extensions = "i", "m", "a", "f", "d", "c", "v", "zicbom", > + "zicbop", "zicboz", "zicntr", "zicond", "zicsr", > + "zifencei", "zihintpause", "zihpm", "zfh", "zba", > + "zbb", "zbc", "zbs", "zkt", "zvfh", "zvkt", > + "sscofpmf", "sstc", "svinval", "svnapot", "svpbmt"; > + riscv,cbom-block-size = <64>; > + riscv,cbop-block-size = <64>; > + riscv,cboz-block-size = <64>; > + mmu-type = "riscv,sv39"; > + > + cpu3_intc: interrupt-controller { > + compatible = "riscv,cpu-intc"; > + interrupt-controller; > + #interrupt-cells = <1>; > + }; > + }; > + > + cpu_4: cpu@4 { > + compatible = "spacemit,x60", "riscv"; > + device_type = "cpu"; > + reg = <4>; > + riscv,isa = "rv64imafdcv_zicbom_zicbop_zicboz_zicntr_zicond_zicsr_zifencei_zihintpause_zihpm_zfh_zba_zbb_zbc_zbs_zkt_zvfh_zvkt_sscofpmf_sstc_svinval_svnapot_svpbmt"; > + riscv,isa-base = "rv64i"; > + riscv,isa-extensions = "i", "m", "a", "f", "d", "c", "v", "zicbom", > + "zicbop", "zicboz", "zicntr", "zicond", "zicsr", > + "zifencei", "zihintpause", "zihpm", "zfh", "zba", > + "zbb", "zbc", "zbs", "zkt", "zvfh", "zvkt", > + "sscofpmf", "sstc", "svinval", "svnapot", "svpbmt"; > + riscv,cbom-block-size = <64>; > + riscv,cbop-block-size = <64>; > + riscv,cboz-block-size = <64>; > + mmu-type = "riscv,sv39"; > + > + cpu4_intc: interrupt-controller { > + compatible = "riscv,cpu-intc"; > + interrupt-controller; > + #interrupt-cells = <1>; > + }; > + }; > + > + cpu_5: cpu@5 { > + compatible = "spacemit,x60", "riscv"; > + device_type = "cpu"; > + reg = <5>; > + riscv,isa = "rv64imafdcv_zicbom_zicbop_zicboz_zicntr_zicond_zicsr_zifencei_zihintpause_zihpm_zfh_zba_zbb_zbc_zbs_zkt_zvfh_zvkt_sscofpmf_sstc_svinval_svnapot_svpbmt"; > + riscv,isa-base = "rv64i"; > + riscv,isa-extensions = "i", "m", "a", "f", "d", "c", "v", "zicbom", > + "zicbop", "zicboz", "zicntr", "zicond", "zicsr", > + "zifencei", "zihintpause", "zihpm", "zfh", "zba", > + "zbb", "zbc", "zbs", "zkt", "zvfh", "zvkt", > + "sscofpmf", "sstc", "svinval", "svnapot", "svpbmt"; > + riscv,cbom-block-size = <64>; > + riscv,cbop-block-size = <64>; > + riscv,cboz-block-size = <64>; > + mmu-type = "riscv,sv39"; > + > + cpu5_intc: interrupt-controller { > + compatible = "riscv,cpu-intc"; > + interrupt-controller; > + #interrupt-cells = <1>; > + }; > + }; > + > + cpu_6: cpu@6 { > + compatible = "spacemit,x60", "riscv"; > + device_type = "cpu"; > + reg = <6>; > + riscv,isa = "rv64imafdcv_zicbom_zicbop_zicboz_zicntr_zicond_zicsr_zifencei_zihintpause_zihpm_zfh_zba_zbb_zbc_zbs_zkt_zvfh_zvkt_sscofpmf_sstc_svinval_svnapot_svpbmt"; > + riscv,isa-base = "rv64i"; > + riscv,isa-extensions = "i", "m", "a", "f", "d", "c", "v", "zicbom", > + "zicbop", "zicboz", "zicntr", "zicond", "zicsr", > + "zifencei", "zihintpause", "zihpm", "zfh", "zba", > + "zbb", "zbc", "zbs", "zkt", "zvfh", "zvkt", > + "sscofpmf", "sstc", "svinval", "svnapot", "svpbmt"; > + riscv,cbom-block-size = <64>; > + riscv,cbop-block-size = <64>; > + riscv,cboz-block-size = <64>; > + mmu-type = "riscv,sv39"; > + > + cpu6_intc: interrupt-controller { > + compatible = "riscv,cpu-intc"; > + interrupt-controller; > + #interrupt-cells = <1>; > + }; > + }; > + > + cpu_7: cpu@7 { > + compatible = "spacemit,x60", "riscv"; > + device_type = "cpu"; > + reg = <7>; > + riscv,isa = "rv64imafdcv_zicbom_zicbop_zicboz_zicntr_zicond_zicsr_zifencei_zihintpause_zihpm_zfh_zba_zbb_zbc_zbs_zkt_zvfh_zvkt_sscofpmf_sstc_svinval_svnapot_svpbmt"; > + riscv,isa-base = "rv64i"; > + riscv,isa-extensions = "i", "m", "a", "f", "d", "c", "v", "zicbom", > + "zicbop", "zicboz", "zicntr", "zicond", "zicsr", > + "zifencei", "zihintpause", "zihpm", "zfh", "zba", > + "zbb", "zbc", "zbs", "zkt", "zvfh", "zvkt", > + "sscofpmf", "sstc", "svinval", "svnapot", "svpbmt"; > + riscv,cbom-block-size = <64>; > + riscv,cbop-block-size = <64>; > + riscv,cboz-block-size = <64>; > + mmu-type = "riscv,sv39"; > + > + cpu7_intc: interrupt-controller { > + compatible = "riscv,cpu-intc"; > + interrupt-controller; > + #interrupt-cells = <1>; > + }; > + }; > + > + }; > + > + soc { > + compatible = "simple-bus"; > + interrupt-parent = <&plic>; > + #address-cells = <2>; > + #size-cells = <2>; > + dma-noncoherent; > + ranges; > + > + uart0: serial@d4017000 { > + compatible = "spacemit,k1-uart", "intel,xscale-uart"; no, this is not a correct hw modeling. The doc on spacemit says all the uart support 64 bytes FIFO, declaring xscale only makes use of 32 bytes FIFO. IIRC, 8250_pxa is a xscale uart with 64 bytes FIFO, so this should be "mrvl,pxa-uart" or "mrvl,mmp-uart" > + reg = <0x0 0xd4017000 0x0 0x100>; > + interrupts = <42>; > + clock-frequency = <14857000>; once clk is ready, you will remove this property and add clk phandles, so why not bring clk, pinctrl, reset before hand? > + reg-shift = <2>; > + reg-io-width = <4>; > + status = "disabled"; > + }; > + > + uart2: serial@d4017100 { > + compatible = "spacemit,k1-uart", "intel,xscale-uart"; > + reg = <0x0 0xd4017100 0x0 0x100>; > + interrupts = <44>; > + clock-frequency = <14857000>; > + reg-shift = <2>; > + reg-io-width = <4>; > + status = "disabled"; > + }; > + > + uart3: serial@d4017200 { > + compatible = "spacemit,k1-uart", "intel,xscale-uart"; > + reg = <0x0 0xd4017200 0x0 0x100>; > + interrupts = <45>; > + clock-frequency = <14857000>; > + reg-shift = <2>; > + reg-io-width = <4>; > + status = "disabled"; > + }; > + > + uart4: serial@d4017300 { > + compatible = "spacemit,k1-uart", "intel,xscale-uart"; > + reg = <0x0 0xd4017300 0x0 0x100>; > + interrupts = <46>; > + clock-frequency = <14857000>; > + reg-shift = <2>; > + reg-io-width = <4>; > + status = "disabled"; > + }; > + > + uart5: serial@d4017400 { > + compatible = "spacemit,k1-uart", "intel,xscale-uart"; > + reg = <0x0 0xd4017400 0x0 0x100>; > + interrupts = <47>; > + clock-frequency = <14857000>; > + reg-shift = <2>; > + reg-io-width = <4>; > + status = "disabled"; > + }; > + > + uart6: serial@d4017500 { > + compatible = "spacemit,k1-uart", "intel,xscale-uart"; > + reg = <0x0 0xd4017500 0x0 0x100>; > + interrupts = <48>; > + clock-frequency = <14857000>; > + reg-shift = <2>; > + reg-io-width = <4>; > + status = "disabled"; > + }; > + > + uart7: serial@d4017600 { > + compatible = "spacemit,k1-uart", "intel,xscale-uart"; > + reg = <0x0 0xd4017600 0x0 0x100>; > + interrupts = <49>; > + clock-frequency = <14857000>; > + reg-shift = <2>; > + reg-io-width = <4>; > + status = "disabled"; > + }; > + > + uart8: serial@d4017700 { > + compatible = "spacemit,k1-uart", "intel,xscale-uart"; > + reg = <0x0 0xd4017700 0x0 0x100>; > + interrupts = <50>; > + clock-frequency = <14857000>; > + reg-shift = <2>; > + reg-io-width = <4>; > + status = "disabled"; > + }; > + > + uart9: serial@d4017800 { > + compatible = "spacemit,k1-uart", "intel,xscale-uart"; > + reg = <0x0 0xd4017800 0x0 0x100>; > + interrupts = <51>; > + clock-frequency = <14857000>; > + reg-shift = <2>; > + reg-io-width = <4>; > + status = "disabled"; > + }; > + > + plic: interrupt-controller@e0000000 { > + compatible = "spacemit,k1-plic", "sifive,plic-1.0.0"; > + reg = <0x0 0xe0000000 0x0 0x4000000>; > + interrupts-extended = <&cpu0_intc 11>, <&cpu0_intc 9>, > + <&cpu1_intc 11>, <&cpu1_intc 9>, > + <&cpu2_intc 11>, <&cpu2_intc 9>, > + <&cpu3_intc 11>, <&cpu3_intc 9>, > + <&cpu4_intc 11>, <&cpu4_intc 9>, > + <&cpu5_intc 11>, <&cpu5_intc 9>, > + <&cpu6_intc 11>, <&cpu6_intc 9>, > + <&cpu7_intc 11>, <&cpu7_intc 9>; > + interrupt-controller; > + #address-cells = <0>; > + #interrupt-cells = <1>; > + riscv,ndev = <159>; > + }; > + > + clint: timer@e4000000 { > + compatible = "spacemit,k1-clint", "sifive,clint0"; > + reg = <0x0 0xe4000000 0x0 0x10000>; > + interrupts-extended = <&cpu0_intc 3>, <&cpu0_intc 7>, > + <&cpu1_intc 3>, <&cpu1_intc 7>, > + <&cpu2_intc 3>, <&cpu2_intc 7>, > + <&cpu3_intc 3>, <&cpu3_intc 7>, > + <&cpu4_intc 3>, <&cpu4_intc 7>, > + <&cpu5_intc 3>, <&cpu5_intc 7>, > + <&cpu6_intc 3>, <&cpu6_intc 7>, > + <&cpu7_intc 3>, <&cpu7_intc 7>; > + }; > + }; > +}; > > -- > 2.45.2 > > > _______________________________________________ > linux-riscv mailing list > linux-riscv@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-riscv _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv