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https://github.com/brain-hackers/u-boot-brain
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6218d4bdce
We have two commands to change the bootmode fuses: mfgr_fuse which set fuse 0/5 and 0/6 and updt_fuse which burns bit 4 of 0/5. Before Image 2.6 we fused in mfgr_fuse 0x5062, which boots from the user partition of the eMMC. To workaround certain hangs we moved to fastboot mode and using the first bootpartition of the eMMC requiring a fuse value of 0x5072 which could be achived by the then added updt_fuse command. At the same time the mfgr_fuse command was changed to also fuse 0x5072, revert that second change so that one can fuse both values, one with just mfgr_fuse and the later with mfgr_fuse;updt_fuse. Note that the mfgr_fuse command is only needed at module production time, a customer might need to use updt_fuse when upgrading an older module to be compatible with a newer image. The command is integrated into the image update scripts. Signed-off-by: Max Krummenacher <max.krummenacher@toradex.com> Acked-by: Stefan Agner <stefan.agner@toradex.com> Acked-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
98 lines
2.1 KiB
C
98 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2014-2016, Toradex AG
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*/
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/*
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* Helpers for i.MX OTP fusing during module production
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*/
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#include <common.h>
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#ifndef CONFIG_SPL_BUILD
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#include <console.h>
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#include <fuse.h>
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static int mfgr_fuse(void)
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{
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unsigned val, val6;
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fuse_sense(0, 5, &val);
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printf("Fuse 0, 5: %8x\n", val);
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fuse_sense(0, 6, &val6);
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printf("Fuse 0, 6: %8x\n", val6);
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fuse_sense(4, 3, &val);
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printf("Fuse 4, 3: %8x\n", val);
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fuse_sense(4, 2, &val);
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printf("Fuse 4, 2: %8x\n", val);
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if (val6 & 0x10) {
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puts("BT_FUSE_SEL already fused, will do nothing\n");
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return CMD_RET_FAILURE;
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}
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/* boot cfg */
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fuse_prog(0, 5, 0x00005062);
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/* BT_FUSE_SEL */
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fuse_prog(0, 6, 0x00000010);
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return CMD_RET_SUCCESS;
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}
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int do_mfgr_fuse(cmd_tbl_t *cmdtp, int flag, int argc,
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char * const argv[])
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{
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int ret;
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puts("Fusing...\n");
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ret = mfgr_fuse();
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if (ret == CMD_RET_SUCCESS)
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puts("done.\n");
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else
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puts("failed.\n");
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return ret;
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}
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int do_updt_fuse(cmd_tbl_t *cmdtp, int flag, int argc,
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char * const argv[])
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{
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unsigned val;
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int ret;
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int confirmed = argc >= 1 && !strcmp(argv[1], "-y");
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/* can be used in scripts for command availability check */
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if (argc >= 1 && !strcmp(argv[1], "-n"))
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return CMD_RET_SUCCESS;
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/* boot cfg */
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fuse_sense(0, 5, &val);
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printf("Fuse 0, 5: %8x\n", val);
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if (val & 0x10) {
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puts("Fast boot mode already fused, no need to fuse\n");
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return CMD_RET_SUCCESS;
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}
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if (!confirmed) {
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puts("Warning: Programming fuses is an irreversible operation!\n"
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" Updating to fast boot mode prevents easy\n"
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" downgrading to previous BSP versions.\n"
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"\nReally perform this fuse programming? <y/N>\n");
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if (!confirm_yesno())
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return CMD_RET_FAILURE;
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}
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puts("Fusing fast boot mode...\n");
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ret = fuse_prog(0, 5, 0x00005072);
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if (ret == CMD_RET_SUCCESS)
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puts("done.\n");
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else
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puts("failed.\n");
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return ret;
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}
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U_BOOT_CMD(
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mfgr_fuse, 1, 0, do_mfgr_fuse,
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"OTP fusing during module production",
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""
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);
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U_BOOT_CMD(
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updt_fuse, 2, 0, do_updt_fuse,
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"OTP fusing during module update",
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"updt_fuse [-n] [-y] - boot cfg fast boot mode fusing"
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);
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#endif /* CONFIG_SPL_BUILD */
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