doc:appunti:hardware:technicolor_tg789vac_v2
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doc:appunti:hardware:technicolor_tg789vac_v2 [2020/03/18 15:58] – [Router Bircked] niccolo | doc:appunti:hardware:technicolor_tg789vac_v2 [2020/03/18 17:02] – [Router Bircked] niccolo | ||
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=== Forcing a bank switch === | === Forcing a bank switch === | ||
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+ | Someone says that this Technicolor router has **two memory banks** to store (flash) the firmware. | ||
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+ | * In normal condition, the router boot from bank_1. | ||
+ | * Flashing via **TFTP** will write to **bank_1** only. It will do so even if the active bank is currently bank_2. It will never set bank_1 as active. | ||
+ | * If something goes bad during the kernel load, the router automatically tries to reboot from the other bank. | ||
+ | * You can see what bank is active by reading **/ | ||
+ | * FIXME Is there a software command to switch from bank_1 to bank_2? | ||
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+ | So I immagine at least two methods to force the router to boot from the other bank: | ||
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+ | - Load a bad image via TFTP flashing (e.g. by disconnecting the cable during the upload, or powering the router off during the flash. I did not tried it. | ||
+ | - Force some **memory read errors** during bootstrap. This can be accomplished by connecting the **RE#** line (pin 8) of the TSOP chip to ground for some short times during bootstrap. This was **[[https:// | ||
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+ | {{tg789vac_v2_tsop-pinout.jpg? | ||
===== Credits and Web References ===== | ===== Credits and Web References ===== | ||
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* **[[https:// | * **[[https:// | ||
* **[[https:// | * **[[https:// | ||
+ | * **[[https:// | ||
* **[[https:// | * **[[https:// | ||
+ | * **[[https:// |
doc/appunti/hardware/technicolor_tg789vac_v2.txt · Last modified: 2020/03/23 18:52 by niccolo