charliem_1216 wrote:
> Hi Chris --
>
> --- In Christian Gagneraud <>
> wrote:
>> Hi there,
>>
>> According to the ts7800 manual, there's a register at address
>> 0xE800000C to control the timing of the PC/104 bus, and this register
>> should contains some default power-on values.
>
> IIRC, the ts7800 comes up in GPIO mode, and you have to switch to
> ISA/PC-104 mode by writing to some registers. Are you doing that already?
Yes, I do. Thre's 4 registers for this purpose. But then there is this
one to fine-tuned the bus timing...
>
> regards, ........ Charlie
>
>> My problem is that if i read the register with a "peek32 0xE800000C",
>> i get 0x16bdc, which doesn't correspond to the expected value. For a
>> default ISA strobe length of 40 and a default setup length of 14, i
>> should get something like 0x162A8.
>>
>> If i try with 0x162FF (max timing), the system freeze as soon as i try
>> to read anything. 0x162A8 seems to work better, i can see that the
>> peripheral board is accessed (there's a LED that show PC104 access on
>> it), but the values returned looks a bit random.
>>
>> I would like to configure the ISA bus in a state which will be as
>> compatible as possible with the ISA specs.
>> Can anyone explain me why do i get these default power-on values? And
>> which value will really put me into a kind of ISA compliant mode?
>>
>> I tried to play with this register, since i can't get a peripheral
>> board working, the kernel module need to read/write a couple of
>> registers on the bus, unfortunately reading these registers return
>> always 0, and i'm sure that i should get something different.
>> Basically, here is what the code is doing:
>>
>> // board configured for ISA address 0x180
>> int io_base = 0xEE000000 + 0x180
>> volatile uint8_t* reg_base = __ioremap( io_base, 4096, 0);
>> uint8_t value = *reg_base;
>> // value is always 0x00 with peek32 0xE800000C 0x16bdc
>> // value looks a bit random with peek32 0xE800000C 0x162A8
>>
>> With best regards,
>> Chris
>>
>
>
>
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