[kernel] r7547 - people/dannf

[Dann Frazier]

Author: dannf
Date: Thu Sep 28 18:43:29 2006
New Revision: 7547

Modified:
   people/dannf/etch-release-notes

Log:
add a section on ia64 console shuffling

Modified: people/dannf/etch-release-notes
==============================================================================
--- people/dannf/etch-release-notes	(original)
+++ people/dannf/etch-release-notes	Thu Sep 28 18:43:29 2006
@@ -10,3 +10,113 @@
 linux-image packages without the -smp suffix support will support
 multiprocessor systems.
 
+Upgrading from sarge
+--------------------
+[Arch: ia64]
+If you have an HP machine and you're using the MP serial console
+port (the connector labelled "console" on the 3-headed cable), this
+upgrading to etch will break your console!
+
+Please read the following information provided by Bjorn Helgaas:
+
+HOW TO FIX IT:
+
+ 1) The console device will change from /dev/ttyS0 to /dev/ttyS1,
+    ttyS2, or ttyS3, so:
+
+    1a) Edit /etc/inittab to add a getty entry for
+           /dev/ttyS1 (rx4640, rx5670, rx7620, rx8620, Superdome),
+           /dev/ttyS2 (rx1600), or
+           /dev/ttyS3 (rx2600).
+
+    1b) Edit /etc/securetty to add ttyS1, ttyS2, or ttyS3.
+
+    1c) Leave the existing ttyS0 entries in /etc/inittab and  
+        /etc/securetty so you can still boot old kernels.
+
+ 2) Edit /etc/elilo.conf to remove any "console=" arguments (see
+ [1]).
+
+ 3) Run elilo to install the bootloader with new configuration.
+
+ 4) Reboot and use the EFI boot option maintenance menu to select
+    exactly one device for console output, input, and standard
+    error.
+    Then do a cold reset so the changes take effect.
+
+    For the MP console, be careful to select the device with
+    "Acpi(HWP0002,700)/Pci(...)/Uart" in the path (see [2]).
+
+DETAILS:
+
+  - Prior to this patch, serial device names depended on the HCDP,
+    which in turn depends on EFI console settings.  After this
+    patch,
+    the naming always stays the same, regardless of firmware
+    settings.
+
+    For example, an rx1600 with a single built-in serial port plus
+    an MP has these ports:
+                                   Old             Old
+                  MMIO         (EFI console    (EFI console
+                 address        on builtin)     on MP port)      New
+                ----------     ------------    ------------      -----
+    builtin     0xff5e0000        ttyS0           ttyS1          ttyS0
+    MP UPS      0xf8031000        ttyS1           ttyS2          ttyS1
+    MP Console  0xf8030000        ttyS2           ttyS0          ttyS2
+    MP 2        0xf8030010        ttyS3           ttyS3          ttyS3
+    MP 3        0xf8030038        ttyS4           ttyS4          ttyS4
+
+  - If you want to have multiple devices in the EFI console path,
+  you
+    can, but Linux won't be able to deduce which console to use, so
+    it
+    will default to using VGA.  You can use "console=hcdp" (the UART
+    device from the EFI path) or "console=ttyS<n>" to select the
+    device directly.
+
+TROUBLESHOOTING:
+
+  - No kernel output after "Uncompressing Linux... done":
+
+        -> You're using an MP port as the console and specified
+           "console=ttyS0".  This port is now named something else.
+           Remove the "console=" option.
+
+        -> Multiple UARTs selected as EFI console devices, and
+	  you're
+           looking at the wrong one.  Make sure only one UART is
+           selected (use the EFI Boot Manager "Boot option
+	     maintenance"
+           menu).
+
+        -> You're physically connected to the MP port but have a
+           non-MP UART selected as EFI console device.  Either move
+           the console cable to the non-MP UART, or change the EFI
+           console path to the MP UART (the MP UART is the one with
+           "Acpi(HWP0002,700)/Pci(...)/Uart" in it.)
+
+  - Long pause (60+ seconds) between "Uncompressing Linux... done"
+    and start of kernel output:
+
+        -> No early console, probably because you used
+	  "console=ttyS<n>".
+           Remove the "console=" option.
+
+  - Kernel and init script output works fine, but no "login:"
+  prompt:
+
+        -> Add getty entry to /etc/inittab for console tty.  Use the
+	  table
+           in (1a) above or look for the "Adding console on ttyS<n>"
+	     message
+           that tells you which device is the console.
+
+  - "login:" prompt, but can't login as root:
+
+        -> Add entry to /etc/securetty for console tty.
+
+
+[1] When the EFI console path contains exactly one device (either
+    serial or VGA), 2.6.6 and newer kernels default 
+