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# Elgon
This page describes how to run coreboot on the [Elgon] compute board
from [OpenCellular].
## TODO
* Add hard reset control
## Flashing coreboot
```{eval-rst}
+---------------------+------------+
| Type | Value |
+=====================+============+
| Socketed flash | no |
+---------------------+------------+
| Model | W25Q128 |
+---------------------+------------+
| Size | 16 MiB |
+---------------------+------------+
| In circuit flashing | yes |
+---------------------+------------+
| Package | SOIC-8 |
+---------------------+------------+
| Write protection | No |
+---------------------+------------+
| Dual BIOS feature | No |
+---------------------+------------+
| Internal flashing | yes |
+---------------------+------------+
```
### Internal programming
The SPI flash can be accessed using [flashrom].
### External programming
The EVT board does have a pinheader to flash the SOIC-8 in circuit.
Directly connecting a Pomona test-clip on the flash is also possible.
**Total board view of EVT**
![][elgon1]
[elgon1]: elgon1.jpg
**Closeup view of SOIC-8 flash IC and USB serial connector of EVT (marked blue)**
![][elgon2]
[elgon2]: elgon2.jpg
**SPI header (marked blue)**
![][elgon_conn_j9_pcb]
[elgon_conn_j9_pcb]: elgon_conn_j9_pcb.jpg
**SPI header pinout**
Dediprog compatible pinout.
![][elgon_conn_j9]
[elgon_conn_j9]: elgon_conn_j9.png
## Technology
```{eval-rst}
+---------------+----------------------------------------+
| SoC | :doc:`../../soc/cavium/cn81xx/index` |
+---------------+----------------------------------------+
| CPU | Cavium ARMv8-Quadcore `CN81XX`_ |
+---------------+----------------------------------------+
.. _CN81XX: https://www.cavium.com/product-octeon-tx-cn80xx-81xx.html
```
[Elgon]: https://github.com/Telecominfraproject/OpenCellular
[OpenCellular]: https://code.fb.com/connectivity/introducing-opencellular-an-open-source-wireless-access-platform/
[flashrom]: https://flashrom.org/Flashrom
|
