NFS mounted rootfs possible via PCMCIA NIC ?

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Hello list,

I am trying to configure a notebook with a PCMCIA NIC to boot over network. (kernel 2.4.20)
In order to accomplish this I passed over the neccessary configuration paramters through the boot loader (ip, root, nfsroot)

The problem is: When the kernel is booting it is trying to configure the Network interface, before it has been activated.

Thus my question is: Is it possible somehow to change the order by some configuration parameter ?!?

Thanks for answers in advance

- -Andreas

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PCMCIA relies in part on user space. You can do this, it involves building a large initrd with a dhcp client on it that sets up pcmcia, then nfs mounts stuff, then pivot_root()'s into it. Its not exactly trivial

...

Thanks for your reply. I get the basic idea from what you say. But what do you mean by pivot_root()'ing into it ?!?

I'll try Andrew Morton's suggestion first, because it sounds easier. If I can't get it running I'll try your suggestion.

regards
-Andreas

Followup to:  <[email protected]>
By author:    Andreas Schaufler <[email protected]>
In newsgroup: linux.dev.kernel

pivot_root() is a system call which flips the root directory around. See Documentation/initrd.txt.

-hpa

<[email protected]> at work, <[email protected]> in private!
"Unix gives you enough rope to shoot yourself in the foot."
http://www.zytor.com/~hpa/puzzle.txt	<[email protected]>

Nope. The kernel does the NFS thing before bringing up cardbus.

This patch worked, back in the 2.4.17 days. It also fixes some cardbus bugs. I don't immediately recall what they were.

 drivers/pcmcia/Makefile |    3 +
 drivers/pcmcia/ds.c     |   13 ++-----
 drivers/pcmcia/yenta.c  |   85 ++++++++++++++++++++++--------------------------
 init/main.c             |    3 -
 4 files changed, 45 insertions(+), 59 deletions(-)

@@ -968,14 +968,7 @@ int __init init_pcmcia_ds(void)
     return 0;
 }
 
-#ifdef MODULE
-
-int __init init_module(void)
-{
-    return init_pcmcia_ds();
-}
-
-void __exit cleanup_module(void)
+void __exit cleanup_pcmcia_ds(void)
 {
     int i;
 #ifdef CONFIG_PROC_FS

@@ -990,4 +983,6 @@ void __exit cleanup_module(void)
     kfree(socket_table);
 }
 
-#endif
+module_init(init_pcmcia_ds);
+module_exit(cleanup_pcmcia_ds);
+

@@ -22,7 +22,7 @@ ifeq ($(CONFIG_CARDBUS),y)
 endif
 
 ifeq ($(CONFIG_PCMCIA),y)
-  obj-y   := cistpl.o rsrc_mgr.o bulkmem.o ds.o cs.o
+  obj-y   := cistpl.o rsrc_mgr.o bulkmem.o cs.o
   ifeq ($(CONFIG_CARDBUS),y)
     obj-y += cardbus.o yenta.o pci_socket.o
   endif

@@ -38,6 +38,7 @@ ifeq ($(CONFIG_PCMCIA),y)
   ifeq ($(CONFIG_HD64465_PCMCIA),y)
     obj-y += hd64465_ss.o
   endif
+  obj-y   += ds.o
 else
   ifeq ($(CONFIG_PCMCIA),m)
     obj-m   := pcmcia_core.o ds.o

@@ -533,9 +533,6 @@ static void __init do_basic_setup(void)
 	irda_proto_init();
 	irda_device_init(); /* Must be done after protocol initialization */
 #endif
-#ifdef CONFIG_PCMCIA
-	init_pcmcia_ds();		/* Do this last */
-#endif
 }
 
 extern void prepare_namespace(void);

_

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I got the 2.4.17 sources and applied the patch. yenta.c and main.c could not be patched automatically, so I tried to apply it by hand line by line. Unfortunately when I boot a kernel compiled witch this modified sources I get an "Unable to handle kernel pagin request at virtual address 0000413d"

Maybe this patch is to be used on some Pre Version of 2.4.17 ?!?!

regards
- -Andreas
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Sorry, that patch was against 2.4.20. It was last tested in 2.4.17.

Am Donnerstag, 12. Dezember 2002 18:35 schrieb Andrew Morton:
...

Ok, thank you very much. It did not patch automatically in 2.4.20 though. But after I applied it manually everything works fine.

Now I can use my old Notebook, which has a broken IDE Controller, again :-)

best regards from a happy Linux User
-Andreas