{"id":19595,"date":"2021-04-14T19:16:48","date_gmt":"2021-04-14T19:16:48","guid":{"rendered":"https:\/\/www.engeniustech.com\/?p=19595"},"modified":"2026-02-23T14:37:17","modified_gmt":"2026-02-23T22:37:17","slug":"dual-image-on-engenius-designed-arm-based-product-families","status":"publish","type":"post","link":"https:\/\/www.engeniustech.com\/span\/dual-image-on-engenius-designed-arm-based-product-families\/","title":{"rendered":"Imagen dual en familias de productos basadas en ARM dise\u00f1adas por EnGenius"},"content":{"rendered":"
\nChin-Ting Chu<\/span>  |  <\/span>Ingeniero de software<\/span>\n<\/div>\n

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\n<\/hr>\n

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\nRESUMEN: este documento contiene informaci\u00f3n sobre los cambios necesarios para admitir im\u00e1genes duales en el nivel del cargador de arranque. La imagen dual es una idea viable para proporcionar firmware alternativo entre dos particiones de firmware. Cuando el firmware actual est\u00e1 roto, restablecemos la entrada del kernel y lo iniciamos. Lo m\u00e1s importante es que realizamos la actualizaci\u00f3n del firmware en la partici\u00f3n inactiva. Si no hay nada de malo en ello, el proceso de actualizaci\u00f3n intercambiar\u00e1 la entrada del kernel. Por lo tanto, podemos mantener un firmware de arranque en nuestro dispositivo todo el tiempo.<\/span>
\n
<\/br>
\nI. Introducci\u00f3n<\/span><\/p>\n

El cargador de arranque realiza una inicializaci\u00f3n de hardware de bajo nivel, como procesador, memoria, ethernet, flash, PCI, UART, etc. Despu\u00e9s de establecer las configuraciones del sistema, el cargador de arranque carga el kernel y pasa la informaci\u00f3n de inicio, incluidas las velocidades del puerto serie, las velocidades de reloj, la tabla de particiones y otros datos de configuraci\u00f3n del hardware.<\/span><\/p>\n

Cuando se carga el kernel, configura el hardware, asigna la memoria, carga los controladores, inserta los m\u00f3dulos, monta el sistema de archivos ra\u00edz y ejecuta los procesos de preinicio. El paso final es generar el proceso de inicio, el primer proceso de espacio de usuario. Los tres tipos de OpenWRT basado en ARM son solo NOR, solo NAND y NOR m\u00e1s NAND.<\/span>
\n
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\n<\/p>\n

Figura 1: Solo NOR, solo NAND, NOR y NAND<\/span><\/div>\n

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\nII - Procedimiento<\/span><\/p>\n

I. NOR solo flash<\/span>
\n
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\n<\/p>\n

Figura 2: Utilice el primer firmware, solo NOR<\/span><\/div>\n

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\n
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\n1. Cargador de arranque: cuando se enciende, el cargador de arranque verificar\u00e1 la marca de imagen dual, "active_fw"<\/span><\/p>\n

1.1. Agregue particiones adicionales a mtdparts: kernel_1 y rootfs_1<\/span>
\n1.2. Cargue el kernel de destino en la memoria<\/span>
\n1.3. Asigne una partici\u00f3n ra\u00edz activa del sistema de archivos configurando los par\u00e1metros de arranque.<\/span>
\n1.3.1. Si "active_fw = 0" => root = rootfs<\/span>
\n1.3.2. Si "active_fw = 1" => root = rootfs_1<\/span>
\n1.4. Si el kernel de arranque falla, intercambie la partici\u00f3n de firmware activa<\/span><\/p>\n

2. Kernel Space: analiza los bootargs asignados por el gestor de arranque y monta el sistema de archivos ra\u00edz.<\/span><\/p>\n

3. Espacio de usuario: cuando se actualiza el sistema<\/span><\/p>\n

3.1. Si "active_fw = 1" =><\/span>
\n3.1.1. flash kernel y rootfs<\/span>
\n3.1.2. establecer active_fw = 0<\/span>
\n3.1.3. reiniciar<\/span>
\n3.2. Si "active_fw = 0" =><\/span>
\n3.2.1. flash kernel_1 y rootfs_1<\/span>
\n3.2.2. establecer active_fw = 0<\/span>
\n3.2.3. reiniciar<\/span><\/p>\n

II .. Solo flash NAND
El procedimiento es el mismo que el de 'Solo flash NOR'.<\/span><\/p>\n

III .. NOR + NAND<\/span>
\n
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\n<\/p>\n

Figura 3: Utilice el segundo firmware - NOR + NAND<\/span><\/div>\n

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\n
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\n1. Cargador de arranque: cuando se enciende, el cargador de arranque verificar\u00e1 la marca de imagen dual, "active_fw"<\/span><\/p>\n

1.1. Agregue dos particiones NAND llamadas rootfs y fs2<\/span>
\n1.1.1 Si "active_fw = 0" =><\/span><\/p>\n

La mitad superior de NAND se llama rootfs y la otra se llama fs2.<\/span><\/p>\n

1.1.2 Si "active_fw = 1" =><\/span><\/p>\n

La mitad superior de NAND se llama fs2 y la otra se llama rootfs.<\/span><\/p>\n

1.2. Cargue el kernel de destino en la memoria<\/span>
\n1.3. Si el kernel de arranque falla, intercambie la partici\u00f3n de firmware activa<\/span><\/p>\n

2. Espacio del Kernel: Bajo la estructura NOR + NAND, siempre usamos la partici\u00f3n llamada rootfs como el sistema de archivos ra\u00edz.
\n<\/span><\/p>\n

3. Espacio de usuario: cuando se actualiza el sistema
El procedimiento es el mismo que el de 'Solo flash NOR'.<\/span>
\n
<\/br><\/p>\n

lll - Implementar<\/span><\/p>\n

Particiones MTD: dos partes iguales para dos firmes<\/span><\/p>\n

II. Bandera de imagen dual: establezca una partici\u00f3n de firmware activa<\/span><\/p>\n

III. Actualizaci\u00f3n del sistema: actualice siempre la partici\u00f3n de firmware inactiva
\n<\/span><\/p>\n

IV. Recuperaci\u00f3n autom\u00e1tica: si el uboot encuentra que el arranque falla desde esta partici\u00f3n de firmware, active la otra partici\u00f3n de firmware.<\/span>
\n
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A. NOR solo flash<\/span><\/p>\n

<\/p>\n

Figura 4: Tabla de particiones MTD: solo NOR<\/span><\/div>\n

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\n
<\/br>
\n1. Cree dos particiones de firmware<\/span><\/p>\n

1.1. modificar nor-partition.xml para decirle al gestor de arranque la informaci\u00f3n de las nuevas particiones<\/span>
\n1.2. modificar sys_flash_map.mk para indicarle a la tabla de particiones mtd del kernel<\/span><\/p>\n

2. Bandera de imagen dual<\/span><\/p>\n

2.1. Modifique board.c para agregar "active_fw" al entorno predeterminado de uboot<\/span>
\n2.2. Modifique cmd_bootipq.c para intercambiar los argumentos de arranque (root = rootfs o root = rootfs_1).<\/span><\/p>\n

3. Actualizaci\u00f3n del sistema<\/span><\/p>\n

3.1. marque "active_fw" y actualice el firmware de destino partici\u00f3n@ipq806x.sh<\/span>
\n3.1.1. "Active_fw = 1" => kernel flash y rootfs<\/span>
\n3.1.2. "Active_fw = 0" => flash kernel_1 y rootfs_1<\/span><\/p>\n

4. Recuperaci\u00f3n autom\u00e1tica<\/span><\/p>\n

4.1. Modifique board.c para asegurarse de que uboot capture el valor de retorno de la funci\u00f3n de arranque<\/span><\/p>\n

B. Solo flash NAND<\/span><\/p>\n

El procedimiento es el mismo que el de 'Solo flash NOR'.<\/span>
\n
<\/br>
\nC. NOR + NAND<\/span><\/p>\n

<\/p>\n

Figura 5: Tabla de particiones MTD cuando active_fw = 0 - NOR + NAND<\/span><\/div>\n

<\/br>
\n
<\/br>
\n1. Cree dos particiones de firmware<\/span><\/p>\n

1.1. Modifique bootipq.c para agregar particiones llamadas fs2<\/span>
\n1.2. Modifique bootm.c para pasar la informaci\u00f3n de la partici\u00f3n atags. al kernel<\/span><\/p>\n

2. Bandera de imagen dual<\/span><\/p>\n

2.1. agregue "active_fw" al entorno predeterminado de uboot<\/span><\/p>\n

3. Actualizaci\u00f3n del sistema<\/span><\/p>\n

3.1. marque "active_fw" y actualice el firmware de destino partici\u00f3n@ipq806x.sh<\/span>
\n3.1.1. Flash de la partici\u00f3n fs2<\/span><\/p>\n

4. Recuperaci\u00f3n autom\u00e1tica<\/span><\/p>\n

4.1. Modifique board.c para asegurarse de que uboot capture el valor de retorno de la funci\u00f3n de arranque<\/span><\/p>\n

<\/br>
\nDescargar PDF><\/a><\/span>
\n
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\n<\/hr>\n

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\nVer todos los art\u00edculos t\u00e9cnicos><\/a><\/span>
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<\/br><\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"

Documento t\u00e9cnico <\/span>- La imagen dual es una idea viable para proporcionar firmware alternativo entre dos particiones de firmware. Cuando el firmware actual est\u00e1 roto, restablecemos la entrada del kernel y lo iniciamos.<\/p>","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"content-type":"","inline_featured_image":false,"footnotes":""},"categories":[],"tags":[],"class_list":["post-19595","post","type-post","status-publish","format-standard","hentry"],"acf":[],"yoast_head":"\nTechnical Paper: ARM-based Product Families | EnGenius<\/title>\n<meta name=\"description\" content=\"Dual Image on EnGenius Designed ARM-based Product Families: The changes required to support dual images in the bootloader level.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.engeniustech.com\/span\/dual-image-on-engenius-designed-arm-based-product-families\/\" \/>\n<meta property=\"og:locale\" content=\"es_MX\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Dual Image on EnGenius Designed ARM-based Product Families\" \/>\n<meta property=\"og:description\" content=\"Dual Image on EnGenius Designed ARM-based Product Families: The changes required to support dual images in the bootloader level.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.engeniustech.com\/span\/dual-image-on-engenius-designed-arm-based-product-families\/\" \/>\n<meta property=\"og:site_name\" content=\"engeniustech\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/EnGeniusTech\" \/>\n<meta property=\"article:published_time\" content=\"2021-04-14T19:16:48+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-02-23T22:37:17+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.engeniustech.com\/wp-content\/uploads\/2021\/04\/techpaper-2-1.jpg\" \/>\n<meta name=\"author\" content=\"Allan 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