From patchwork Thu Nov 3 18:51:51 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christian Loehle X-Patchwork-Id: 621278 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id AFF8EC433FE for ; Thu, 3 Nov 2022 18:52:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230525AbiKCSwA convert rfc822-to-8bit (ORCPT ); Thu, 3 Nov 2022 14:52:00 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43406 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230340AbiKCSv4 (ORCPT ); Thu, 3 Nov 2022 14:51:56 -0400 Received: from mail5.swissbit.com (mail5.swissbit.com [148.251.244.252]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EAA79F7E for ; Thu, 3 Nov 2022 11:51:53 -0700 (PDT) Received: from mail5.swissbit.com (localhost [127.0.0.1]) by DDEI (Postfix) with ESMTP id 0EC493A1F1D; Thu, 3 Nov 2022 19:51:52 +0100 (CET) Received: from mail5.swissbit.com (localhost [127.0.0.1]) by DDEI (Postfix) with ESMTP id F310E3A1F1B; Thu, 3 Nov 2022 19:51:51 +0100 (CET) X-TM-AS-ERS: 10.149.2.42-127.5.254.253 X-TM-AS-SMTP: 1.0 ZXguc3dpc3NiaXQuY29t Y2xvZWhsZUBoeXBlcnN0b25lLmNvbQ== X-DDEI-TLS-USAGE: Used Received: from ex.swissbit.com (sbdeex04.sbitdom.lan [10.149.2.42]) by mail5.swissbit.com (Postfix) with ESMTPS; Thu, 3 Nov 2022 19:51:51 +0100 (CET) Received: from sbdeex04.sbitdom.lan (10.149.2.42) by sbdeex04.sbitdom.lan (10.149.2.42) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.9; Thu, 3 Nov 2022 19:51:51 +0100 Received: from sbdeex04.sbitdom.lan ([fe80::2047:4968:b5a0:1818]) by sbdeex04.sbitdom.lan ([fe80::2047:4968:b5a0:1818%9]) with mapi id 15.02.1118.009; Thu, 3 Nov 2022 19:51:51 +0100 From: =?iso-8859-1?q?Christian_L=F6hle?= To: "ulf.hansson@linaro.org" , "linux-mmc@vger.kernel.org" CC: Avri Altman Subject: [PATCHv3] mmc-utils: Implement alternative boot operation Thread-Topic: [PATCHv3] mmc-utils: Implement alternative boot operation Thread-Index: AdjvtTotZkuh0EQzTjmgArInEQi3XA== Date: Thu, 3 Nov 2022 18:51:51 +0000 Message-ID: Accept-Language: en-US, de-DE Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.242.2.7] MIME-Version: 1.0 X-TMASE-Version: DDEI-5.1-9.0.1002-27242.002 X-TMASE-Result: 10--2.450600-10.000000 X-TMASE-MatchedRID: 6E41RGmUyPq9nTq7rJdwXKekGZXOwUBuUrr7Qc5WhKjAuQ0xDMaXkHU3 oKSu0J1xwUvinrDLhqnSbuZ7S4XjmuM08db7ghTyA9lly13c/gGUq+GQ/zyJdN8pqleQItEFhFA nTzcsrmVnBd+7QItl3U2jo2v+wN3NbVcsZW9h4Cgdahq+rGDn//NkoMDX+kiul8eCd8viB1TToh hY3qi5AnMWeasl9UKPJcenWlfqR84pQD5WvouNbIXQ/hu1OV/0c7WhpDnUK40AIXlMppp3X0/Lm ZgDl1csU5+9+/1J0rsoPQ/c1fY3gcm0JnqSM1ZkIGmn4OlOtCOk2H/b/X5aJZ7oC1rVz/uNo8WM kQWv6iUig6xaCvyzXY6HM5rqDwqtzFiyZ1wVw5onHDd7FSY23N+1yxoOeesEAi9XhgjNwjNEFgt Jh4H8/Q== X-TMASE-SNAP-Result: 1.821001.0001-0-1-22:0,33:0,34:0-0 X-TMASE-INERTIA: 0-0;;;; X-TMASE-XGENCLOUD: 8658c22f-03e6-4ffc-9c4d-df704cd6b3cf-0-0-200-0 Precedence: bulk List-ID: X-Mailing-List: linux-mmc@vger.kernel.org Implements the alternative boot operation for eMMCs. Note the limitations of the help. This is mostly useful for testing purposes if you set up the boot partition configuration correctly. Usage: $ sudo dd if=/dev/mmcblk2boot0 of=bootdatammcblk count=2 2+0 records in 2+0 records out 1024 bytes (1.0 kB, 1.0 KiB) copied, 0.00482308 s, 212 kB/s $ sudo ./mmc boot_operation bootdata /dev/mmcblk2 $ diff -s bootdata bootdatammcblk Files bootdata and bootdatammcblk are identical Signed-off-by: Christian Loehle Reviewed-by: Avri Altman --- -v3: Alternative boot mode support check -v2: Frees, closes, removal of boot_blocks parameter and boot ack check mmc.c | 12 +++++++ mmc.h | 2 ++ mmc_cmds.c | 103 +++++++++++++++++++++++++++++++++++++++++++++++++++++ mmc_cmds.h | 1 + 4 files changed, 118 insertions(+) diff --git a/mmc.c b/mmc.c index 170ee39..adcd814 100644 --- a/mmc.c +++ b/mmc.c @@ -255,6 +255,18 @@ static struct Command commands[] = { "Issues a CMD0 GO_PRE_IDLE", NULL }, + { do_alt_boot_op, -1, + "boot_operation", " \n" + "Does the alternative boot operation and writes the specified starting blocks of boot data into the requested file.\n\n" + "Note some limitations\n:" + "1. The boot operation must be configured, e.g. for legacy speed:\n" + "mmc-utils bootbus set single_backward retain x8 /dev/mmcblk2\n" + "mmc-utils bootpart enable 1 0 /dev/mmcblk2\n" + "2. The MMC must currently be running at the bus mode that is configured for the boot operation (HS200 and HS400 not supported at all).\n" + "3. Only up to 512K bytes of boot data will be transferred.\n" + "4. The MMC will perform a soft reset, if your system cannot handle that do not use the boot operation from mmc-utils.\n", + NULL + }, { 0, 0, 0, 0 } }; diff --git a/mmc.h b/mmc.h index 6511dbc..6f1bf3e 100644 --- a/mmc.h +++ b/mmc.h @@ -24,6 +24,7 @@ #define MMC_GO_IDLE_STATE 0 /* bc */ #define MMC_GO_IDLE_STATE_ARG 0x0 #define MMC_GO_PRE_IDLE_STATE_ARG 0xF0F0F0F0 +#define MMC_BOOT_INITIATION_ARG 0xFFFFFFFA #define MMC_SWITCH 6 /* ac [31:0] See below R1b */ #define MMC_SEND_EXT_CSD 8 /* adtc R1 */ #define MMC_SEND_STATUS 13 /* ac [31:16] RCA R1 */ @@ -97,6 +98,7 @@ #define EXT_CSD_CACHE_SIZE_0 249 #define EXT_CSD_SEC_FEATURE_SUPPORT 231 #define EXT_CSD_BOOT_INFO 228 /* R/W */ +#define EXT_CSD_BOOT_MULT 226 /* RO */ #define EXT_CSD_HC_ERASE_GRP_SIZE 224 #define EXT_CSD_HC_WP_GRP_SIZE 221 #define EXT_CSD_SEC_COUNT_3 215 diff --git a/mmc_cmds.c b/mmc_cmds.c index 3db17e1..e6d3273 100644 --- a/mmc_cmds.c +++ b/mmc_cmds.c @@ -3101,3 +3101,106 @@ int do_preidle(int nargs, char **argv) return 0; } + +int do_alt_boot_op(int nargs, char **argv) +{ + int fd, ret, boot_data_fd; + char *device, *boot_data_file; + struct mmc_ioc_multi_cmd *mioc; + __u8 ext_csd[512]; + __u8 *boot_buf; + unsigned int boot_blocks, ext_csd_boot_size; + + if (nargs != 3) { + fprintf(stderr, "Usage: mmc boot_op \n"); + exit(1); + } + boot_data_file = argv[1]; + device = argv[2]; + + fd = open(device, O_RDWR); + if (fd < 0) { + perror("open device"); + exit(1); + } + + ret = read_extcsd(fd, ext_csd); + if (ret) { + perror("read extcsd"); + goto dev_fd_close; + } + if (!(ext_csd[EXT_CSD_BOOT_INFO] & EXT_CSD_BOOT_INFO_ALT)) { + ret = -EINVAL; + perror("Card does not support alternative boot mode"); + goto dev_fd_close; + } + if (ext_csd[EXT_CSD_PART_CONFIG] & EXT_CSD_PART_CONFIG_ACC_ACK) { + ret = -EINVAL; + perror("Boot Ack must not be enabled"); + goto dev_fd_close; + } + ext_csd_boot_size = ext_csd[EXT_CSD_BOOT_MULT] * 128 * 1024; + boot_blocks = ext_csd_boot_size / 512; + if (ext_csd_boot_size > MMC_IOC_MAX_BYTES) { + printf("Boot partition size is bigger than IOCTL limit, limiting to 512K\n"); + boot_blocks = MMC_IOC_MAX_BYTES / 512; + } + + boot_data_fd = open(boot_data_file, O_WRONLY | O_CREAT, 0644); + if (boot_data_fd < 0) { + perror("open boot data file"); + ret = 1; + goto boot_data_close; + } + + boot_buf = calloc(1, sizeof(__u8) * boot_blocks * 512); + mioc = calloc(1, sizeof(struct mmc_ioc_multi_cmd) + + 2 * sizeof(struct mmc_ioc_cmd)); + if (!mioc || !boot_buf) { + perror("Failed to allocate memory"); + ret = -ENOMEM; + goto alloced_error; + } + + mioc->num_of_cmds = 2; + mioc->cmds[0].opcode = MMC_GO_IDLE_STATE; + mioc->cmds[0].arg = MMC_GO_PRE_IDLE_STATE_ARG; + mioc->cmds[0].flags = MMC_RSP_NONE | MMC_CMD_AC; + mioc->cmds[0].write_flag = 0; + + mioc->cmds[1].opcode = MMC_GO_IDLE_STATE; + mioc->cmds[1].arg = MMC_BOOT_INITIATION_ARG; + mioc->cmds[1].flags = MMC_RSP_NONE | MMC_CMD_ADTC; + mioc->cmds[1].write_flag = 0; + mioc->cmds[1].blksz = 512; + mioc->cmds[1].blocks = boot_blocks; + /* Access time of boot part differs wildly, spec mandates 1s */ + mioc->cmds[1].data_timeout_ns = 2 * 1000 * 1000 * 1000; + mmc_ioc_cmd_set_data(mioc->cmds[1], boot_buf); + + ret = ioctl(fd, MMC_IOC_MULTI_CMD, mioc); + if (ret) { + perror("multi-cmd ioctl error\n"); + goto alloced_error; + } + + ret = DO_IO(write, boot_data_fd, boot_buf, boot_blocks * 512); + if (ret < 0) { + perror("Write error\n"); + goto alloced_error; + } + ret = 0; + +alloced_error: + if (mioc) + free(mioc); + if (boot_buf) + free(boot_buf); +boot_data_close: + close(boot_data_fd); +dev_fd_close: + close(fd); + if (ret) + exit(1); + return 0; +} diff --git a/mmc_cmds.h b/mmc_cmds.h index faab362..5f2bef1 100644 --- a/mmc_cmds.h +++ b/mmc_cmds.h @@ -49,3 +49,4 @@ int do_erase(int nargs, char **argv); int do_general_cmd_read(int nargs, char **argv); int do_softreset(int nargs, char **argv); int do_preidle(int nargs, char **argv); +int do_alt_boot_op(int nargs, char **argv);