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| freemangordon | NishanthMenon: http://e2e.ti.com/support/dsp/omap_applications_processors/f/447/p/391467/1385640#1385640 | 22:50 |
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| freemangordon | NishanthMenon: any idea on how to ask that question better? | 22:51 |
| NishanthMenon | freemangordon, :( | 23:11 |
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| Pali | NishanthMenon: really you cannot comment how to detect if kernel has read (or write) access to specific address range? | 23:39 |
| NishanthMenon | Pali, unfortunately, it is not my call here :( | 23:40 |
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| NishanthMenon | firewall programming is done usually by secure end of bootloader | 23:42 |
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| NishanthMenon | Pali, unfortuantely, i am not pirvy to how it is done OR detect if it was done :( | 23:42 |
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| NishanthMenon | esp when NOLO firewall configurations are not in TI control :( | 23:43 |
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| NishanthMenon | Pali, as you can understand most folks in TI wont probably even know since the firewall registers themselves may probably blocked out as well :( | 23:43 |
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| NishanthMenon | Pali, freemangordon anything you suggest I can help with? (I have no approval authority ofcourse to release information).. I can try pushing it up chain once more? | 23:45 |
| NishanthMenon | if that helps.. :( | 23:45 |
| Pali | NishanthMenon: I mean to use some "generic" way to check if address X is readable | 23:47 |
| NishanthMenon | Pali the trouble with firwalls is that it generates l3 errors | 23:48 |
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| NishanthMenon | so on the same device based on bootloader configuration, the address range may or maynot be accessible | 23:48 |
| NishanthMenon | ideally it is a bootloader decision to enable or disable the dt node depending on it's configuration | 23:48 |
| NishanthMenon | but given the historic nature of bootloader involved here... all i can think of is to disable the node for all devices :( | 23:49 |
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| Pali | and what happen when board generate l3 error? it is only interrupt? cannot kernel handle this error, forward it to driver and ignore it? | 23:51 |
| Pali | (instead crash) | 23:51 |
| NishanthMenon | Depends on secure world handler that is embedded in bootloader | 23:52 |
| NishanthMenon | it generates a security violation in general (at least from my omap4 memory) | 23:53 |
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| NishanthMenon | Pali, my memory of omap3 is pretty rusty unfortunately :( | 23:54 |
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| Pali | and what security violation means? | 23:54 |
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| Pali | immediately board reboot? | 23:54 |
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| NishanthMenon | Pali, if i recollect something to do with trustzone handlers.. reboot or just plain printing information or even bricking the device is determined by the secure exception handler involved.. aka.. what ever the NOLO security team dreamt up.. | 23:56 |
| NishanthMenon | obviously, i have never had access to NOLO secure world.. i think very very few people actually were allowed to look there.. | 23:57 |
| Pali | ok, so it is device/software specific | 23:58 |
| NishanthMenon | Pali, it is (again from my memory of omap4).. | 23:58 |
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