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GET /api/patches/1600610/?format=api
{ "id": 1600610, "url": "http://patchwork.ozlabs.org/api/patches/1600610/?format=api", "web_url": "http://patchwork.ozlabs.org/project/uboot/patch/20220303204400.2787389-11-sean.anderson@seco.com/", "project": { "id": 18, "url": "http://patchwork.ozlabs.org/api/projects/18/?format=api", "name": "U-Boot", "link_name": "uboot", "list_id": "u-boot.lists.denx.de", "list_email": "u-boot@lists.denx.de", "web_url": null, "scm_url": null, "webscm_url": null, "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20220303204400.2787389-11-sean.anderson@seco.com>", "list_archive_url": null, "date": "2022-03-03T20:43:53", "name": "[10/17] spl: Add semihosting boot method", "commit_ref": null, "pull_url": null, "state": "superseded", "archived": false, "hash": "22cfd2af7378395650ad4ea93b107b950d1686d4", "submitter": { "id": 80860, "url": "http://patchwork.ozlabs.org/api/people/80860/?format=api", "name": "Sean Anderson", "email": "sean.anderson@seco.com" }, "delegate": { "id": 3651, "url": "http://patchwork.ozlabs.org/api/users/3651/?format=api", "username": "trini", "first_name": "Tom", "last_name": "Rini", "email": "trini@ti.com" }, "mbox": "http://patchwork.ozlabs.org/project/uboot/patch/20220303204400.2787389-11-sean.anderson@seco.com/mbox/", "series": [ { "id": 288836, "url": "http://patchwork.ozlabs.org/api/series/288836/?format=api", "web_url": "http://patchwork.ozlabs.org/project/uboot/list/?series=288836", "date": "2022-03-03T20:43:44", "name": "arm: semihosting: Cleanups and new features", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/288836/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/1600610/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/1600610/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "<u-boot-bounces@lists.denx.de>", "X-Original-To": "incoming@patchwork.ozlabs.org", "Delivered-To": "patchwork-incoming@bilbo.ozlabs.org", "Authentication-Results": [ "bilbo.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=seco.com header.i=@seco.com header.a=rsa-sha256\n header.s=selector1 header.b=DdnoFE3E;\n\tdkim-atps=neutral", "ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.denx.de\n (client-ip=2a01:238:438b:c500:173d:9f52:ddab:ee01; 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mx.microsoft.com 1; spf=pass\n smtp.mailfrom=seco.com; dmarc=pass action=none header.from=seco.com;\n dkim=pass header.d=seco.com; arc=none", "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/relaxed; d=seco.com; s=selector1;\n h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck;\n bh=R4t8XHypC7XtVqJy5CBfZZBZOodaxmSJmQf4VPidM5Q=;\n b=DdnoFE3ENekQ/GDkPpz7n5JXeWTIV9vJrrQjGOOBd58Go+tMZalmaj5nouPrLeqCF/M8sOlYKfgMS44dB78kTIOMhyKuOK/E4ztUuhtz80DZzZQpjQnk4c1WP/4zJ5eHenMqkPK3wr/Xh0x40KPnaJ+GXKlgHlwCPIcrZ0jxIeEP9P8EEu7y+413wOanhcazJBqJyqC2p+1ZEKhZMQl49zqFLSL4f3kOXL3Wvnw8nv1HCek0O97orVP34/fMdSsJ9cHISkQ1ldIDHMptCXpRU1hKwZ8a62RjXiZ+K18Jfwa3GbjSZpqIfJOZr0TlyVuld9HEjpxPxN7ogRjjpR2R7Q==", "From": "Sean Anderson <sean.anderson@seco.com>", "To": "Simon Glass <sjg@chromium.org>", "Cc": "Linus Walleij <linus.walleij@linaro.org>, Tom Rini <trini@konsulko.com>,\n u-boot@lists.denx.de, Sean Anderson <sean.anderson@seco.com>", "Subject": "[PATCH 10/17] spl: Add semihosting boot method", "Date": "Thu, 3 Mar 2022 15:43:53 -0500", "Message-Id": "<20220303204400.2787389-11-sean.anderson@seco.com>", "X-Mailer": "git-send-email 2.25.1", "In-Reply-To": "<20220303204400.2787389-1-sean.anderson@seco.com>", "References": "<20220303204400.2787389-1-sean.anderson@seco.com>", "Content-Transfer-Encoding": "8bit", "Content-Type": "text/plain", "X-ClientProxiedBy": "MN2PR16CA0013.namprd16.prod.outlook.com\n (2603:10b6:208:134::26) To DB7PR03MB4523.eurprd03.prod.outlook.com\n (2603:10a6:10:19::27)", "MIME-Version": "1.0", "X-MS-PublicTrafficType": "Email", "X-MS-Office365-Filtering-Correlation-Id": "6accd380-1cac-4aa4-fd1c-08d9fd569d47", "X-MS-TrafficTypeDiagnostic": "AM6PR03MB3573:EE_", "X-Microsoft-Antispam-PRVS": "\n <AM6PR03MB3573DED1FD980F405341B22996049@AM6PR03MB3573.eurprd03.prod.outlook.com>", "X-MS-Exchange-SenderADCheck": "1", "X-MS-Exchange-AntiSpam-Relay": "0", "X-Microsoft-Antispam": "BCL:0;", "X-Microsoft-Antispam-Message-Info": "\n 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", "X-Forefront-Antispam-Report": "CIP:255.255.255.255; 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It is\nmostly modeled off of spl_load_image_ext. I am not really sure why/how\nspl_load_image_fat uses three different methods to load the image, but\nthe simple case seems to work OK for now.\n\nTo control the presence of this boot method, we add a config symbol.\nWhile we're at it, we update the original semihosting config symbol.\n\nI think semihosting has some advantages of other forms of JTAG boot.\nCommon other ways to boot from JTAG include:\n\n- Implementing DDR initialization through JTAG (typically with dozens of\n lines of TCL) and then loading U-Boot. The DDR initialization\n typically uses hard-coded register writes, and is not easily adapted\n to different boards. BOOT_DEVICE_SMH allows booting with SPL,\n leveraging U-Boot's existing DDR initialization code. This is the\n method used by NXP's CodeWarrior IDE on Layerscape processors (see\n AN12270).\n- Loading a bootloader into SDRAM, waiting for it to initialize DDR, and\n then loading U-Boot. This is tricky, because the debugger must stop the\n boot after the bootloader has completed its work. Trying to load\n U-Boot too early can cause failure to boot. This is the method used by\n Xilinx with its Zynq(MP) processors.\n- Loading SPL with BOOT_DEVICE_RAM and breaking before SPL loads the\n image to load U-Boot at the appropriate place. This can be a bit\n tricky, because the load address is dependent on the header size. An\n elf with symbols must also be used in order to stop at the appropriate\n point. BOOT_DEVICE_SMH can be viewed as an extension of this process,\n where SPL automatically stops and tells the host where to place the\n image.\n\nSigned-off-by: Sean Anderson <sean.anderson@seco.com>\n---\n\n arch/arm/Kconfig | 25 +++++++++++--\n arch/arm/include/asm/spl.h | 1 +\n common/spl/Makefile | 1 +\n common/spl/spl_semihosting.c | 71 ++++++++++++++++++++++++++++++++++++\n 4 files changed, 94 insertions(+), 4 deletions(-)\n create mode 100644 common/spl/spl_semihosting.c", "diff": "diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig\nindex 391a77c2b4..5cacb292b5 100644\n--- a/arch/arm/Kconfig\n+++ b/arch/arm/Kconfig\n@@ -403,11 +403,28 @@ config ARM_SMCCC\n \t firmware (for example, PSCI) according to SMCCC.\n \n config SEMIHOSTING\n-\tbool \"support boot from semihosting\"\n+\tbool \"Support ARM semihosting\"\n \thelp\n-\t In emulated environments, semihosting is a way for\n-\t the hosted environment to call out to the emulator to\n-\t retrieve files from the host machine.\n+\t Semihosting is a method for a target to communicate with a host\n+\t debugger. It uses special instructions which the debugger will trap\n+\t on and interpret. This allows U-Boot to read/write files, print to\n+\t the console, and execute arbitrary commands on the host system.\n+\n+\t Enabling this option will add support for reading and writing files\n+\t on the host system. If you don't have a debugger attached then trying\n+\t to do this will likely cause U-Boot to hang. Say 'n' if you are unsure.\n+\n+config SPL_SEMIHOSTING\n+\tbool \"Support ARM semihosting in SPL\"\n+\thelp\n+\t Semihosting is a method for a target to communicate with a host\n+\t debugger. It uses special instructions which the debugger will trap\n+\t on and interpret. This allows U-Boot to read/write files, print to\n+\t the console, and execute arbitrary commands on the host system.\n+\n+\t Enabling this option will add support for reading and writing files\n+\t on the host system. If you don't have a debugger attached then trying\n+\t to do this will likely cause U-Boot to hang. Say 'n' if you are unsure.\n \n config SYS_THUMB_BUILD\n \tbool \"Build U-Boot using the Thumb instruction set\"\ndiff --git a/arch/arm/include/asm/spl.h b/arch/arm/include/asm/spl.h\nindex e568af2561..b5790bd0bc 100644\n--- a/arch/arm/include/asm/spl.h\n+++ b/arch/arm/include/asm/spl.h\n@@ -30,6 +30,7 @@ enum {\n \tBOOT_DEVICE_DFU,\n \tBOOT_DEVICE_XIP,\n \tBOOT_DEVICE_BOOTROM,\n+\tBOOT_DEVICE_SMH,\n \tBOOT_DEVICE_NONE\n };\n #endif\ndiff --git a/common/spl/Makefile b/common/spl/Makefile\nindex db8fd36a26..e71e7bee66 100644\n--- a/common/spl/Makefile\n+++ b/common/spl/Makefile\n@@ -28,6 +28,7 @@ obj-$(CONFIG_$(SPL_TPL_)USB_STORAGE) += spl_usb.o\n obj-$(CONFIG_$(SPL_TPL_)FS_FAT) += spl_fat.o\n obj-$(CONFIG_$(SPL_TPL_)FS_EXT4) += spl_ext.o\n obj-$(CONFIG_$(SPL_TPL_)SATA) += spl_sata.o\n+obj-$(CONFIG_$(SPL_TPL_)SEMIHOSTING) += spl_semihosting.o\n obj-$(CONFIG_$(SPL_TPL_)DFU) += spl_dfu.o\n obj-$(CONFIG_$(SPL_TPL_)SPI_LOAD) += spl_spi.o\n obj-$(CONFIG_$(SPL_TPL_)RAM_SUPPORT) += spl_ram.o\ndiff --git a/common/spl/spl_semihosting.c b/common/spl/spl_semihosting.c\nnew file mode 100644\nindex 0000000000..df6aeb2951\n--- /dev/null\n+++ b/common/spl/spl_semihosting.c\n@@ -0,0 +1,71 @@\n+// SPDX-License-Identifier: GPL-2.0+\n+/*\n+ * Copyright (C) 2022 Sean Anderson <sean.anderson@seco.com>\n+ */\n+\n+#include <common.h>\n+#include <image.h>\n+#include <log.h>\n+#include <semihosting.h>\n+#include <spl.h>\n+\n+static int smh_read_full(long fd, void *memp, size_t len)\n+{\n+\tlong read;\n+\n+\tread = smh_read(fd, memp, len);\n+\tif (read < 0)\n+\t\treturn read;\n+\tif (read != len)\n+\t\treturn -EIO;\n+\treturn 0;\n+}\n+\n+static int spl_smh_load_image(struct spl_image_info *spl_image,\n+\t\t\t struct spl_boot_device *bootdev)\n+{\n+\tconst char *filename = CONFIG_SPL_FS_LOAD_PAYLOAD_NAME;\n+\tint ret;\n+\tlong fd, len;\n+\tstruct image_header *header =\n+\t\tspl_get_load_buffer(-sizeof(*header), sizeof(*header));\n+\n+\tfd = smh_open(filename, MODE_READ | MODE_BINARY);\n+\tif (fd < 0) {\n+\t\tlog_debug(\"could not open %s: %ld\\n\", filename, fd);\n+\t\treturn fd;\n+\t}\n+\n+\tret = smh_flen(fd);\n+\tif (ret < 0) {\n+\t\tlog_debug(\"could not get length of image: %d\\n\", ret);\n+\t\tgoto out;\n+\t}\n+\tlen = ret;\n+\n+\tret = smh_read_full(fd, header, sizeof(struct image_header));\n+\tif (ret) {\n+\t\tlog_debug(\"could not read image header: %d\\n\", ret);\n+\t\tgoto out;\n+\t}\n+\n+\tret = spl_parse_image_header(spl_image, bootdev, header);\n+\tif (ret) {\n+\t\tlog_debug(\"failed to parse image header: %d\\n\", ret);\n+\t\tgoto out;\n+\t}\n+\n+\tret = smh_seek(fd, 0);\n+\tif (ret) {\n+\t\tlog_debug(\"could not seek to start of image: %d\\n\", ret);\n+\t\tgoto out;\n+\t}\n+\n+\tret = smh_read_full(fd, (void *)spl_image->load_addr, len);\n+\tif (ret)\n+\t\tlog_debug(\"could not read %s: %d\\n\", filename, ret);\n+out:\n+\tsmh_close(fd);\n+\treturn ret;\n+}\n+SPL_LOAD_IMAGE_METHOD(\"SEMIHOSTING\", 0, BOOT_DEVICE_SMH, spl_smh_load_image);\n", "prefixes": [ "10/17" ] }