Success: My E55 (9000/856) runs bash-2.04 via PDC
Hello PA-RISC community.
Again and again I want to have my E55 running Linux, but the problem is the serial lines (8-port MDP) is a proprietary interface. So I needed a solution.
I had the idea to use the PDC console, months ago.
Today hacked a driver (template was serial.c) for a polling PDC device driver. I called it pdc_drv.c, the device is "ttyQ0", with MAJOR 30, MINOR 0
and I use a polling period of 30ms (enough for a serial console i/f).
Because I have not further implemented the internel console i/f for my driver, I used the hack with the link of
/dev/console --> /dev/ttyQ0
And my machine boots up via NFS !
Perhaps we can make a "driver" out of this "hack" !
In my driver I also use the hack, I have done for the serial.c, that with `^\' I can reboot ( machine_restart() ) the computer to work remote on it !
With friendly regards
Christoph P.
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[parisc-linux] One further step ... success: My E55 (9000/856) runs bash-2.04 via PDC
Quoted 37 lines · Christoph Plattner
Hello PA-RISC community.
Again and again I want to have my E55 running Linux, but the problem is the serial lines (8-port MDP) is a proprietary interface. So I needed a solution.
I had the idea to use the PDC console, months ago.
Today hacked a driver (template wasserial.c) for a polling PDC device driver. I called itpdc_drv.c, the device is "ttyQ0", with MAJOR 30, MINOR 0
and I use a polling period of 30ms (enough for a serial console i/f).Because I have not further implemented the internel console i/f for my driver, I used the hack with the link of
/dev/console --> /dev/ttyQ0And my machine boots up via NFS !
Perhaps we can make a "driver" out of this "hack" !
In my driver I also use the hack, I have done for the
serial.c, that with `^\' I can reboot (machine_restart()) the computer to work remote on it !With friendly regards
Christoph P.
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[parisc-linux] One further step ... success: My E55 (9000/856) runs bash-2.04 via PDC
In reply to Christoph PlattnerOne further step !
I saw in pdc_cons.c (under arch/parisc/kernel/) that the device 'ttyB'... is
defined for the PDC console. So I changed the driver and added the driver
as "device" in pdc_cons.c, in the console structure.
So no the thing is accessed in the correct way. The /dev/console is original
(major=5, minor=1) and not a link to anywhere, and the kernel command line
has the string "console=ttyB0". (/dev/ttyB0 is major=30, minor=0) !
With friendly regards
Christoph
PS: I wrote these last mails, because there are some E45/E55 users out there,
and they are not happy not being able to boot linux. Now there is a way to use
it via NFS ROOT with the following restrictions:
- Only port ttyB0 is usable (polling driver, only port 0 console of
MDP)
- No SCSI support (only NFS ROOT !)
- nO support of the parallel port.
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Quoted 37 lines · Christoph Plattner
Hello PA-RISC community.
Again and again I want to have my E55 running Linux, but the problem is the serial lines (8-port MDP) is a proprietary interface. So I needed a solution.
I had the idea to use the PDC console, months ago.
Today hacked a driver (template wasserial.c) for a polling PDC device driver. I called itpdc_drv.c, the device is "ttyQ0", with MAJOR 30, MINOR 0
and I use a polling period of 30ms (enough for a serial console i/f).Because I have not further implemented the internel console i/f for my driver, I used the hack with the link of
/dev/console --> /dev/ttyQ0And my machine boots up via NFS !
Perhaps we can make a "driver" out of this "hack" !
In my driver I also use the hack, I have done for the
serial.c, that with `^\' I can reboot (machine_restart()) the computer to work remote on it !With friendly regards
Christoph P.
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