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| xobs | True, but right now the primary language is C. | 01:28 |
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| tomu-ci | [tomu-hardware] mithro pushed 2 new commits to master: https://git.io/vNOPH | 02:50 |
| tomu-ci | tomu-hardware/master 5cfa88b Kaspar Emanuel: Make compatible with kitspace.org | 02:50 |
| tomu-ci | tomu-hardware/master 529d66d Tim Ansell: Merge pull request #23 from kitspace-forks/master... | 02:50 |
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| buZz | i'm still not sure what i can even do with tomu :P | 04:16 |
| buZz | is there any usecase? | 04:16 |
| xobs | The most compelling usecase is as a U2F token for one-touch authentication. Like a Yubikey. | 04:28 |
| xobs | But I kind of want to use it as a Vol+ / Vol- dongle as a two-button keyboard :D | 04:28 |
| buZz | oh ok, but wouldnt a USB flashable U2F token only introduce more attack vectors? | 04:31 |
| xobs | It could. It requires physical interaction to flash, unless you get code execution in Chopstx. | 04:34 |
| buZz | hmhm | 04:41 |
| buZz | i'll stick to my yubikey then :P | 04:41 |
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| duncan^ | Seems somewhat naive to suggest Yubikey is better in terms of attack surface. I think it depends on the application. | 07:46 |
| duncan^ | Also recall the ROCA escapade and the problem where one could trivially bypass the pin | 07:47 |
| duncan^ | Maybe it depends if we can dump flash from Tomu with a programmer. I certainly hope not. | 07:48 |
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| ar | well, tomu doesn't have a proper SE, right? | 07:57 |
| xobs | Tomu has an Arm Cortex M0+ in it, which I guess has the benefit of not being susceptible to Spectre / Meltdown. | 08:17 |
| xobs | Kidding aside, no, Tomu doesn't have a proper SE. Nor even any sort of memory protection. | 08:28 |
| xobs | You can dump the flash over SWD. You can disable SWD access by clearing address 0x0FE03FFC in flash. | 08:37 |
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| duncan^ | I thought there is a read-protect bit or something | 09:37 |
| duncan^ | on some variants of Cortex-M ... | 09:37 |
| xobs | I know the KL02 (also an M0+) has the ability to protect areas of memory when not in Supervisor mode. | 10:04 |
| xobs | The EFM32HG doesn't have an equivalent. Nor does it have a full-fledged MMU. | 10:04 |
| kyaputen | xobs: disabling swd is not enough ? Since flash is embedded it should work no? I mean even if you have physical access | 11:47 |
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| kuldeep | Hello everyone | 12:39 |
| kuldeep | i saw the campaign on CS. You guys are playing with USB. | 12:41 |
| kuldeep | i actually maintain the unicore-mx USB host and device stack for ARM microcontroller (that i wrote :). https://github.com/insane-adding-machines/unicore-mx (this include EFM32 support -- afair EFM32HG have a DWC OTG device only) | 12:42 |
| tpb | Title: GitHub - insane-adding-machines/unicore-mx: UniCore-MX | Universal Core for ARM Cortex-M0/0+/3/4/7/X (at github.com) | 12:42 |
| kuldeep | unicore-mx is a fork of libopencm3 (both under lgpl3 licence and community maintained). | 12:45 |
| kuldeep | we have pre written examples (only EFM32LG atm) https://github.com/insane-adding-machines/unicore-mx-examples | 12:46 |
| tpb | Title: GitHub - insane-adding-machines/unicore-mx-examples: Simple example projects showing how to use unicore-mx. (at github.com) | 12:46 |
| kuldeep | ah, esden is already here o/ | 12:47 |
| xobs | kuldeep: Cool! That looks like a lot of nice code. | 13:27 |
| xobs | Do all projects have a flash offset of 0, or do some of the platforms have a different offset for a bootloader to live at the start? | 13:28 |
| kuldeep | xobs, on st the memory bootloader rom is mapped on POR at 0. | 13:31 |
| kuldeep | (if BOOT0 is asserted) | 13:32 |
| kuldeep | xobs, btw, there is bootloader (DFU) but you have to port it to EFM32HG. most of the code is generic, only some backend porting work need to be done. | 13:33 |
| kuldeep | *bootloader (DFU) example | 13:34 |
| xobs | kuldeep: Sounds intriguing. Where is it? | 13:37 |
| kuldeep | xobs, https://github.com/insane-adding-machines/unicore-mx-examples/blob/master/examples/common/usb_dfu/usbdfu.c (generic code -- little bit of stm32 code is still there) + https://github.com/insane-adding-machines/unicore-mx-examples/blob/master/examples/stm32/f1/stm32-h103/usb_dfu/usbdfu-target.c (backend target code) | 13:42 |
| tpb | Title: unicore-mx-examples/usbdfu.c at master · insane-adding-machines/unicore-mx-examples · GitHub (at github.com) | 13:42 |
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