From: Serdar Sutay <serdar.sutay@sentvion.com>
To: Segin <segin2005@gmail.com>
Cc: Linux-8086@Vger.Kernel.Org
Subject: Re: BCC, ELKS 24 Bit addressing mode
Date: Thu, 23 Mar 2006 20:22:58 +0200 [thread overview]
Message-ID: <4422E782.1030302@sentvion.com> (raw)
In-Reply-To: <4422EF6B.20804@gmail.com>
Segin wrote:
> Serdar Sutay wrote:
>
>> Dear All,
>>
>> I am porting ELKS to a special version of 80186 to be used in
>> embedded devices. This special version known as Turbo186 is using 24
>> bit addressing using a special addressing scheme. So I need to modify
>> bcc or as86 to support 24 bit addressing mode.
>>
>> This type of operation is common in embedded usage. 24 bit addressing
>> is working like this,
>>
>> In normal 20 bit addressing when far jumps are used, two 16 bit
>> operands are given for address calculation. First operand is left
>> shifted 4 bits and added to second operand, then 20 bit address is
>> calculated.
>>
>> In 24 bit addressing mode, first operand is left shifted 8 bits and
>> added to second operand, resulting in 24 bit address.
>>
>> What am I required to do to support 24 bits addressing in bcc? Can
>> you give me some insight or guide me to the correct person?
>>
>> Thank you for your consideration and help.
>>
>> Kindest regards,
>>
>> Serdar Sutay
>> -
>> To unsubscribe from this list: send the line "unsubscribe linux-8086" in
>> the body of a message to majordomo@vger.kernel.org
>> More majordomo info at http://vger.kernel.org/majordomo-info.html
>>
> Basically you're working with a 286 that's been lobotmized down to a
> 186 with the addressing features in place?
>
>
yes, but I need to address 16 Mbytes of RAM so I need to use 24 bit
addressing mode.
Can Bcc compiler handle this automatically?
next prev parent reply other threads:[~2006-03-23 18:22 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-03-23 11:01 BCC, ELKS 24 Bit addressing mode Serdar Sutay
2006-03-23 18:56 ` Segin
2006-03-23 18:22 ` Serdar Sutay [this message]
2006-03-24 5:11 ` Dan Olson
2006-03-24 5:17 ` Jody
2006-03-24 5:28 ` Dan Olson
2006-03-25 22:11 ` Gregg C Levine
2006-03-24 9:44 ` Andrey Romanenko
2006-03-23 19:53 ` Jody
2006-03-23 23:00 ` Eric des Courtis
2006-03-24 10:39 ` David Given
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