[coreboot] [PATCH]: Entry key of fintek superio is 8787 instead of 87
stefan.reinauer at coresystems.de
Fri Nov 5 08:51:40 CET 2010
On 11/5/10 12:19 AM, Bao, Zheng wrote:
> According to the description in datasheet of f71889,
> "To enable configuration, the entry key 0x87 must be written to
> the index port"
> -o 4e 87
> -o 4e 87 (enable configuration)
> -o 4e aa (disable configuration)
> This piece of text appears in most of the datasheet of fintek superio.
> It doesnt say it quite clear, but it seems that the 0x87 should
> be written twice. I tried on f81865, which is not in the coreboot tree
> yet. If the 0x87 is only written once, you can only R/W the index/data
> port once. All the subsequent RW will fail. Writing twice will be ok.
> Plus, in the superiotool, the function
> also write 8787.
> The fintek superio chips seem to enable the UART automatically when the
> power is on. So I didnt find it failed to access.
> Signed-off-by: Zheng Bao <zheng.bao at amd.com>
Acked-by: Stefan Reinauer <stepan at coreboot.org>
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