Fix VIA VX*** support

Helge Wagner's patch that added VIA VX900 chipset support made me look
closer at the datasheets which led to some concise documentation about
newer VIA chipsets:

Based on that this patch adds full support for VX800/VX820, VX855/VX875
and VX900, including SPI and LPC. VT8237S was not changed (SPI support
only) because there is no public datasheet and it is not clear how to
distinguish between LPC and SPI strapping and investigations in (NDAed)
documents have not brought up anything conclusively.

enable_flash_vt823x could probably be enhanced too due to various
ignored LPC options of the chipset.

Corresponding to flashrom svn r1578.

Signed-off-by: Helge Wagner <>
Signed-off-by: Stefan Tauner <>
Tested-by: Alexandru Gagniuc <>
Acked-by: Carl-Daniel Hailfinger <>
4 files changed