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Thu, 30 Jan 2020 12:40:00 +0000 (GMT) Received: from eusmtrp2.samsung.com (unknown [182.198.249.139]) by eucas1p1.samsung.com (KnoxPortal) with ESMTPA id 20200130124000eucas1p137943be0fe3e5e1eb45e705dc5c46431~uqoNuQkB42838028380eucas1p1g; Thu, 30 Jan 2020 12:40:00 +0000 (GMT) Received: from eusmgms2.samsung.com (unknown [182.198.249.180]) by eusmtrp2.samsung.com (KnoxPortal) with ESMTP id 20200130124000eusmtrp29bd8676f25fb6eb1b0a30fbf98336b88~uqoNtltLd2643726437eusmtrp2W; Thu, 30 Jan 2020 12:40:00 +0000 (GMT) X-AuditID: cbfec7f2-f0bff7000001ef66-63-5e32cea011e6 Received: from eusmtip1.samsung.com ( [203.254.199.221]) by eusmgms2.samsung.com (EUCPMTA) with SMTP id 8B.EC.07950.0AEC23E5; Thu, 30 Jan 2020 12:40:00 +0000 (GMT) Received: from localhost (unknown [106.120.51.46]) by eusmtip1.samsung.com (KnoxPortal) with ESMTPA id 20200130124000eusmtip11b04f02223def1624a661e1cc2f980a8~uqoNjVG7W1920319203eusmtip1c; Thu, 30 Jan 2020 12:40:00 +0000 (GMT) From: =?utf-8?q?=C5=81ukasz_Stelmach?= To: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org Cc: =?utf-8?q?=C5=81ukasz_Stelmach?= Subject: [RFC PATCH 0/4] boot/loader: Load kernel directly from firmware Date: Thu, 30 Jan 2020 13:39:34 +0100 Message-Id: <20200130123934.3900-1-l.stelmach@samsung.com> X-Mailer: git-send-email 2.20.1 MIME-Version: 1.0 Organization: Samsung R&D Institute Poland X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFmpileLIzCtJLcpLzFFi42LZduznOd0F54ziDPY8sbS4eWgFo8Wmx9dY LS7vmsNmMeP8PiYHFo/NS+o9+rasYvT4vEkugDmKyyYlNSezLLVI3y6BK2N1y3nGgnn6FVs+ nGVvYJyp2sXIySEhYCLx9PYN1i5GLg4hgRWMEj/XTWCCcL4wSjTf+84I4XxmlLj8fwY7TMvs u4ehEssZJS68PsQO4TxnlDi6ZzYLSBWbgKNE/9ITrCC2iEC2xOSPX5hAbGYBe4mJs/6zgdjC Ah4S608/ArNZBFQldq/ax9zFyMHBK2Al8f5wMsQyeYnzvevAFvMKCEqcnPkEbDy/gJbEmqbr LBAj5SWat85mBrlBQuAzm8S8/+dYIZpdJFZua2CEsIUlXh3fAvWBjMT/nfOZQHZJCNRLTJ5k BtHbwyixbc4PFogaa4k7536xgdQwC2hKrN+lD1HuKNG2xAHC5JO48VYQ4gI+iUnbpjNDhHkl OtqEIGaoSKzr3wM1T0qi99UKqFs8JP4tes84gVFxFpK/ZiH5ZRbC2gWMzKsYxVNLi3PTU4sN 81LL9YoTc4tL89L1kvNzNzECU8bpf8c/7WD8einpEKMAB6MSD6/HGaM4IdbEsuLK3EOMEhzM SiK8oq6GcUK8KYmVValF+fFFpTmpxYcYpTlYlMR5jRe9jBUSSE8sSc1OTS1ILYLJMnFwSjUw Cm//8f7NX49fByr5hV2//Nty2GjZ1Zzrdbbu32Nt38/QuS30cAvbWreqX8Z7Lmibzoo8XNv+ f1lPv96/r7cirhqceD4l8wXPUfslR433e2bPdT/THChX8S/6umHfHcuqFoN1kTzO6yoESoMN LbhFj5xKeWv3Z6PfXIlD8va71xx+m/k427nphRJLcUaioRZzUXEiALtU5BsVAwAA X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFvrNLMWRmVeSWpSXmKPExsVy+t/xu7oLzhnFGdz9rW5x89AKRotNj6+x WlzeNYfNYsb5fUwOLB6bl9R79G1ZxejxeZNcAHOUnk1RfmlJqkJGfnGJrVK0oYWRnqGlhZ6R iaWeobF5rJWRqZK+nU1Kak5mWWqRvl2CXsbqlvOMBfP0K7Z8OMvewDhTtYuRk0NCwERi9t3D jF2MXBxCAksZJTac+craxcgBlJCSWDk3HaJGWOLPtS42iJqnjBIX/x9gA0mwCThK9C89wQpi iwjkSlw7dJQdxGYWsJeYOOs/WI2wgIfE+tOPwGwWAVWJ3av2MYPM5xWwknh/OBlivrzE+d51 YK28AoISJ2c+YQEpYRZQl1g/TwgkzC+gJbGm6ToLxHR5ieats5knMArMQtIxC6FjFpKqBYzM qxhFUkuLc9Nzi430ihNzi0vz0vWS83M3MQIDftuxn1t2MHa9Cz7EKMDBqMTD63HGKE6INbGs uDL3EKMEB7OSCK+oq2GcEG9KYmVValF+fFFpTmrxIUZToG8mMkuJJucDozGvJN7Q1NDcwtLQ 3Njc2MxCSZy3Q+BgjJBAemJJanZqakFqEUwfEwenVAMjX/6JY+lNpY9dJ07e7JIx7bv7zf5Z /9TfyR6Lipfp1XQq+TRTstDtRJbqsz9Kbp+erqpfL632cZuJ2UMDyeUyfx79Px0i73fE4P7l hZHxNjLS7xm4QptZP5zTKD0cfaS38tIFrtda7sv8Doc9Slq5wjAj9Kbyhpo10U5J/Ozzrgpu Ewz2rXunxFKckWioxVxUnAgAImLD3Y4CAAA= X-CMS-MailID: 20200130124000eucas1p137943be0fe3e5e1eb45e705dc5c46431 X-Msg-Generator: CA X-RootMTR: 20200130124000eucas1p137943be0fe3e5e1eb45e705dc5c46431 X-EPHeader: CA CMS-TYPE: 201P X-CMS-RootMailID: 20200130124000eucas1p137943be0fe3e5e1eb45e705dc5c46431 References: Sender: linux-samsung-soc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-samsung-soc@vger.kernel.org This patchset is a PoC showing, it is possible and advantageous to integrate platform setup code in the kernel tree instead of maintaining it in a separate bootloader project. Bringing up a new ARM platform today requires developing the following pieces code in both bootloader and kernel: + platform setup (DRAM, minimal set of clocks and PMICs etc) - minimal setup in bootloader - full setup in kernel + device drivers (storage, network interface, display) - in both bootloader and kernel We've noticed that most code required in bootloader can be ported from Linux. This isn't, however, effortless. We also consider further maintenance of two copies of code an unnecessary burden. Making platform setup code a part of kernel source tree makes it possible to reuse existing Linux drivers in bootloading environment as well as to avoid creating and maintainig two different drivers for new devices. The following patches enables building Linux image that is loadable directly by Odroid XU4's firmware (bl2). The goal for such arrangement is to use Linux as a boot loader that later runs a full OS using kexec. Hardkernel, the vendor of Odroid XU4, provides signed, and thus, cumbersome to replace, platform setup code (bl1 and bl2). We decided not to replace them, but rather make the kernel loadable by the bl2 code by adding only a tiny amount of code to set up the consol. The kernel needs, however, to be small enough to be loaded succesfully (1 MiB). The patchset also provides hsinit (in tools/hsinit) userland program, which is a tiny init program that extracts designated archive to initramfs and executes /init. At the moment any initramfs image can be used at this stage. Although hsinit can be linked against glibc it makes little sense because together with the kernel it wont fit in 1 MiB. Instead it is recommended to link hsinit against musl libc. Install musl from your OS vendor or follow the upstream instructions. With musl available enter tools/hsinit and run the following commands. --8<---------------cut here---------------start------------->8--- wget -P vendor/ https://libarchive.org/downloads/libarchive-3.3.2.tar.gz wget -P vendor/ http://prdownloads.sourceforge.net/libpng/zlib-1.2.11.tar.gz ./bootstrap MUSL_DIR=/usr/lib/arm-linux-musleabi/ \ GCC_CROSS_DIR=/usr/lib/gcc-cross/arm-linux-gnueabi/8/ \ CPPFLAGS='-nostdinc -isystem /usr/include/arm-linux-musleabi/' \ CFLAGS='-mthumb -Os -ffunction-sections -fdata-sections' \ LIBARCHIVE_CPP_FLAGS=-I/usr/include/arm-linux-musleabi/ \ LIBARCHIVE_C_FLAGS=$CFLAGS \ ZLIB_C_FLAGS=$CFLAGS \ LDFLAGS="-nostdlib -L${MUSL_DIR}/ -L${GCC_CROSS_DIR}/ ${MUSL_DIR}/crt1.o ${MUSL_DIR}/crti.o ${GCC_CROSS_DIR}/crtbegin.o -Wl,--gc-sections -Wl,--start-group ${GCC_CROSS_DIR}/libgcc.a ${GCC_CROSS_DIR}/libgcc_eh.a -Wl,--end-group ${GCC_CROSS_DIR}/crtend.o ${MUSL_DIR}/crtn.o -s" \ LIBS="-lc -lgcc" \ ./configure --enable-local-libraries --host=arm-linux-gnueabi --enable-static make --8<---------------cut here---------------end--------------->8--- To build bootImage file that is loadable by Odroid XU4's bl2 the following commands need to be issued (CROSS_COMPILE and ARCH ommited) --8<---------------cut here---------------start------------->8--- make odroidxu4_bootloader_defconfig make dtbs make bootImage --8<---------------cut here---------------end--------------->8--- The resulting arch/arm/boot/bootImage should be renamed to u-boot-mmc.bin and flashed onto an SD or eMMC card with sd_fusing scritp. Łukasz Stelmach (4): scripts/dtc: update fdtget.c to upstream version v1.4.7-57-gf267e674d145 scripts: add get_console_base.pl Add tools/hsinit boot/loader: Enable building bootloader replacement for Odroid XU4 arch/arm/Kconfig | 8 + arch/arm/Makefile | 8 +- arch/arm/boot/Makefile | 17 + arch/arm/boot/loader/Kconfig | 23 ++ arch/arm/boot/loader/Makefile | 42 +++ arch/arm/boot/loader/odroid-console.c | 136 ++++++++ arch/arm/boot/loader/odroid-crt0.S | 40 +++ arch/arm/boot/loader/piggy.S | 14 + arch/arm/boot/loader/vectors.S | 112 +++++++ arch/arm/boot/loader/vmlinux.lds | 17 + .../configs/odroidxu4_bootloader_defconfig | 127 ++++++++ scripts/dtc/.gitignore | 4 + scripts/dtc/Makefile | 5 + scripts/dtc/fdtget.c | 125 ++++---- scripts/dtc/update-dtc-source.sh | 4 +- scripts/get_console_base.pl | 26 ++ tools/hsinit/Makefile.am | 29 ++ tools/hsinit/README.org | 56 ++++ tools/hsinit/bootstrap | 7 + tools/hsinit/configure.ac | 128 ++++++++ tools/hsinit/hsinit.c | 299 ++++++++++++++++++ tools/hsinit/vendor/.gitignore | 5 + tools/hsinit/vendor/SHA256SUMS | 2 + 23 files changed, 1177 insertions(+), 57 deletions(-) create mode 100644 arch/arm/boot/loader/Kconfig create mode 100644 arch/arm/boot/loader/Makefile create mode 100644 arch/arm/boot/loader/odroid-console.c create mode 100644 arch/arm/boot/loader/odroid-crt0.S create mode 100644 arch/arm/boot/loader/piggy.S create mode 100644 arch/arm/boot/loader/vectors.S create mode 100644 arch/arm/boot/loader/vmlinux.lds create mode 100644 arch/arm/configs/odroidxu4_bootloader_defconfig create mode 100755 scripts/get_console_base.pl create mode 100644 tools/hsinit/Makefile.am create mode 100644 tools/hsinit/README.org create mode 100755 tools/hsinit/bootstrap create mode 100644 tools/hsinit/configure.ac create mode 100644 tools/hsinit/hsinit.c create mode 100644 tools/hsinit/vendor/.gitignore create mode 100644 tools/hsinit/vendor/SHA256SUMS