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Re: [Qemu-devel] [PATCH] allwinner-a10: add config script support

From: Hans de Goede
Subject: Re: [Qemu-devel] [PATCH] allwinner-a10: add config script support
Date: Thu, 26 Dec 2013 20:40:47 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.2.0


On 12/26/2013 01:58 AM, Li Guang wrote:
Peter Maydell wrote:
On 26 December 2013 00:39, Li Guang<address@hidden>  wrote:
Peter Maydell wrote:
On 26 December 2013 00:14, Li Guang<address@hidden>   wrote:
it's the approach sunxi-linux kernel config hardware,
the binary is actually a transformed text script,
and context of script is like:

card_ctrl = 0
card_high_speed = 1
card_line = 4
sdc_d1 = port:PF00<2><1><default><default>
sdc_d0 = port:PF01<2><1><default><default>
sdc_clk = port:PF02<2><1><default><default>
sdc_cmd = port:PF03<2><1><default><default>
sdc_d3 = port:PF04<2><1><default><default>
sdc_d2 = port:PF05<2><1><default><default>

So what sets this up on real hardware? Is this part of
a firmware blob? Is it in ROM or flash?
it's generally in /boot, bootloader will load it
into ram address 0x43000000, kernel will find it
at this fixed address, and parse it, learn the hardware
related configuration, mostly property of devices, and
GPIOes used.
Weird. Why isn't this just using devicetree?

don't know the exactly reason linux-sunxi community
do this(actually, the script parsing code mostly wrote
by engineer from Allwinner).

I'm one of the linux-sunxi developers, the only reason we've
this fex file abomination, is because we've inherited it
from the android-allwinner sources.

Currently most of the linux-sunxi developers are no longer
focusing on the 3.4 android/allwinner derived sources we
maintain. They are currently in a "good enough for everyday
use" state.

So now most of us are focusing on getting *proper* sunxi
SoC support upstream. This is using device-tree. Currently
we've working timers, interrupt-controller, uarts, mmc,
sata, nic (both 100mbit and Gbit variants), ehci controller
and builtin rtc support with upstream kernels. Which I
believe likely covers everything the qemu emulation offers
atm. For those interested, see:

And the mailinglist reports about progress in that branch.

From the linux-sunxi pov fex files are a legacy thing which
will go away in the future.



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