Red Hat ENTERPRISE LINUX 5.4 - TECHNICAL NOTES Manual page 319

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(BZ#227496)
• If the edac module is loaded, BIOS memory reporting will not work. This is because the edac
module clears the register that the BIOS uses for reporting memory errors.
The current Red Hat Enterprise Linux Driver Update Model instructs the kernel to load all available
modules (including the edac module) by default. If you wish to ensure BIOS memory reporting on
your system, you need to manually blacklist the edac modules. To do so, add the following lines to
/etc/modprobe.conf:
blacklist edac_mc
blacklist i5000_edac
blacklist i3000_edac
blacklist e752x_edac
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(BZ#441329)
• Due to outstanding driver issues with hardware encryption acceleration, users of Intel WiFi Link
4965, 5100, 5150, 5300, and 5350 wireless cards are advised to disable hardware accelerated
encryption using module parameters. Failure to do so may result in the inability to connect to Wired
Equivalent Privacy (WEP) protected wireless networks after connecting to WiFi Protected Access
(WPA) protected wireless networks.
To do so, add the following options to /etc/modprobe.conf:
alias wlan0 iwlagn
options iwlagn swcrypto50=1 swcrypto=1
(where wlan0 is the default interface name of the first Intel WiFi Link device)
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The following note applies to PowerPC Architectures:
• The size of the PPC kernel image is too large for OpenFirmware to support. Consequently, network
booting will fail, resulting in the following error message:
Please wait, loading kernel...
/pci@8000000f8000000/ide@4,1/disk@0:2,vmlinux-anaconda: No such file or directory
boot:
To work around this:
1. Boot to the OpenFirmware prompt, by pressing the '8' key when the IBM splash screen is
displayed.
2. Run the following command:
setenv real-base 2000000
kernel
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