Hi,

As suggested by cyfred, I've written some code to allow /etc/modules.d files 
to be created automatically.

I have attached an updated version of the nvidia-kernel ebuild that uses this, 
  also the nvidia source had to be patched to export parameter descriptions 
(but any well written module will not require this).

Here is the /etc/modules.d/nvidia file which gets produced (it has linewrapped 
in this mail, but hopefully you get the picture)

----------

# Configuration file for nvidia module

# Internal aliases, do not edit
alias char-major-195 nvidia
alias /dev/nvidiactl char-major-195

# Configurable module parameters
# For more details, see /usr/share/doc/nvidia-kernel-1.0.6629/README.gz
#
#  silence_nvidia_output - Silence output: 0 (default, verbose)  or 1 (silent)
#  NVreg_EnableVia4x - Enable AGP4x on VIA chipsets (default disabled)
#  NVreg_EnableALiAGP - Enable AGP on ALi1541/1647 chipsets (default disabled)
#  NVreg_NvAGP - Select which AGPGART is used if unspecified by X - 0 
(disable), 1 (use nvidia), 2 (use kernel), 3 (try 2 then 1, default)
#  NVreg_EnableAGPSBA - Enable AGP Side Band Addressing
#  NVreg_EnableAGPFW - Enable AGP Fast Writes (default disabled)
#  NVreg_SoftEDIDs - Enable dynamic generation of EDID info (default enabled)
#  NVreg_Mobile - Select Mobile registry key when SoftEDIDs is disabled - 0 
(auto, default), 1 (Dell), 2 (Toshiba), 3 (other), 4 (Compal/Toshiba), 5 (Gateway)

# To enable Side Band Adressing and Fast Writes, uncomment the example below:
#  options nvidia NVreg_EnableAGPSBA=1 NVreg_EnableAGPFW=1

-----------

I have also attached an eclass diff which implements this. I'm looking for 
comments on the ebuild interface to this as much as anything else.

I have also added a CONFIG_CHECK_ERROR variable which can be used to specify a 
custom message when support for required components is not detected - the 
attached nvidia module has been converted to using this too.

Daniel

# Copyright 1999-2004 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Header: /var/cvsroot/gentoo-x86/media-video/nvidia-kernel/nvidia-kernel-1.0.6629.ebuild,v 1.9 2004/11/30 01:25:56 cyfred Exp $

inherit eutils linux-mod

X86_PKG_V="pkg1"
AMD64_PKG_V="pkg2"
NV_V="${PV/1.0./1.0-}"
X86_NV_PACKAGE="NVIDIA-Linux-x86-${NV_V}"
AMD64_NV_PACKAGE="NVIDIA-Linux-x86_64-${NV_V}"

DESCRIPTION="Linux kernel module for the NVIDIA X11 driver"
HOMEPAGE="http://www.nvidia.com/"
SRC_URI="x86? (ftp://download.nvidia.com/XFree86/Linux-x86/${NV_V}/${X86_NV_PACKAGE}-${X86_PKG_V}.run)
	amd64? (http://download.nvidia.com/XFree86/Linux-x86_64/${NV_V}/${AMD64_NV_PACKAGE}-${AMD64_PKG_V}.run)"

if use x86; then
	PKG_V="${X86_PKG_V}"
	NV_PACKAGE="${X86_NV_PACKAGE}"
elif use amd64; then
	PKG_V="${AMD64_PKG_V}"
	NV_PACKAGE="${AMD64_NV_PACKAGE}"
fi

S="${WORKDIR}/${NV_PACKAGE}-${PKG_V}/usr/src/nv"

LICENSE="NVIDIA"
SLOT="0"
KEYWORDS="-* ~x86 ~amd64"
RESTRICT="nostrip"
IUSE=""

DEPEND="virtual/linux-sources"
export _POSIX2_VERSION="199209"

MODULE_NAMES="nvidia(video:${S})"
BUILD_PARAMS="IGNORE_CC_MISMATCH=yes V=1 SYSSRC=${KV_DIR} SYSOUT=${KV_OUT_DIR}"
CONFIG_CHECK="MTRR"
CONFIG_CHECK_ERROR="This version needs MTRR support for most chipsets!
Please enable MTRR support in your kernel config, found at:
  Processor type and features -> [*] MTRR (Memory Type Range Register) support
and recompile your kernel"
MODCONFIG_nvidia_README="/usr/share/doc/${PF}/README.gz"
MODCONFIG_nvidia_ALIASES=(
		"char-major-195 nvidia"
		"/dev/nvidiactl char-major-195"
	)
MODCONFIG_nvidia_OPTSTEXT="To enable Side Band Adressing and Fast Writes, uncomment the example below:"
MODCONFIG_nvidia_OPTS="NVreg_EnableAGPSBA=1 NVreg_EnableAGPFW=1"
MODCONFIG_nvidia_OPTSEXAMPLEONLY=yes

src_unpack() {
	# 2.6.10_rc1-mm{1,2,3} all EXPORT_SYMBOL_GPL the udev functions, this breaks loading
	CS="$(grep -c EXPORT_SYMBOL\(class_simple_create\)\; ${KV_DIR}/drivers/base/class_simple.c)"
	if [ "${CS}" == "0" ]
	then
		ewarn "Your current kernel uses EXPORT_SYMBOL_GPL() on some methods required by nvidia-kernel."
		ewarn "This probably means you are using 2.6.10_rc1-mm*. Please change away from mm-sources until this is"
		ewarn "revised and a solution released into the mm branch, development-sources will work."
		die "Incompatible kernel export."
	fi

	if [ ${KV_MINOR} -ge 6 -a ${KV_PATCH} -lt 7 ]
	then
		echo
		ewarn "Your kernel version is ${KV_MAJOR}.${KV_MINOR}.${KV_PATCH}"
		ewarn "This is not officially supported for ${P}. It is likely you"
		ewarn "will not be able to compile or use the kernel module."
		ewarn "It is recommended that you upgrade your kernel to a version >= 2.6.7"
		echo
		ewarn "DO NOT file bug reports for kernel versions less than 2.6.7 as they will be ignored."
	fi

	cd ${WORKDIR}
	bash ${DISTDIR}/${NV_PACKAGE}-${PKG_V}.run --extract-only

	# Add patches below, with a breif description.
	cd ${S}
	# Any general patches should go here
	# Shutup pointer arith warnings
	use x86 && epatch ${FILESDIR}/${PV}/nv-shutup-warnings.patch
	use amd64 && epatch ${FILESDIR}/${PV}/nv-amd64-shutup-warnings.patch
	# Fix a limitation on available video memory bug #71684
	epatch ${FILESDIR}/${PV}/nv-fix-memory-limit.patch
	# Fix the vm_flags to only have VM_IO, and not VM_LOCKED as well
	epatch ${FILESDIR}/${PV}/nv-vm_flags-no-VM_LOCKED.patch
	# Give descriptions to module parameters
	epatch ${FILESDIR}/${PV}/nv-parm-descriptions.patch

	# Now any patches specific to the 2.6 kernel should go here
	if kernel_is 2 6
	then
		einfo "Applying 2.6 kernel patches"
		# Fix the /usr/src/linux/include/asm not existing on koutput issue #58294
		epatch ${FILESDIR}/${PV}/conftest_koutput_includes.patch
		# Fix pgd_offset() -> pml4_pgd_offset() for >=2.6.10-rc1-mm3
		epatch ${FILESDIR}/${PV}/nv-pgd_offset.patch
		# Speedup driver for 2.6 kernel to be on par with 2.4 kernel
		epatch ${FILESDIR}/${PV}/nv-pgprot-speedup.patch
		# Fix calling of smp_processor_id() when preempt is enabled
		epatch ${FILESDIR}/${PV}/nv-disable-preempt-on-smp_processor_id.patch
	fi

	# if you set this then it's your own fault when stuff breaks :)
	[ -n "${USE_CRAZY_OPTS}" ] && sed -i "s:-O:${CFLAGS}:" Makefile.*

	# if greater than 2.6.5 use M= instead of SUBDIR=
	convert_to_m ${S}/Makefile.kbuild
}

src_install() {
	linux-mod_src_install

	# Docs
	dodoc ${S}/../../share/doc/README

	# The device creation script
	into /
	newsbin ${S}/makedevices.sh NVmakedevices.sh
}

pkg_postinst() {
	if [ "${ROOT}" = "/" ] && \
		[ ! -e /dev/.devfsd ] && \
		[ ! -e /dev/.udev ] && \
		[ -x /sbin/NVmakedevices.sh ]
	then
		/sbin/NVmakedevices.sh >/dev/null 2>&1
	fi

	linux-mod_pkg_postinst
}

--- NVIDIA-Linux-x86-1.0-6629-pkg1/usr/src/nv/os-registry.c.orig	2004-12-05 14:00:55.266756864 +0000
+++ NVIDIA-Linux-x86-1.0-6629-pkg1/usr/src/nv/os-registry.c	2004-12-05 14:28:46.819642200 +0000
@@ -112,6 +112,8 @@
 
 static int NVreg_EnableVia4x = 0;
 NV_MODULE_PARAMETER(NVreg_EnableVia4x);
+MODULE_PARM_DESC(NVreg_EnableVia4x, "Enable AGP4x on VIA chipsets "
+	"(default disabled)");
 
 /*
  * Option: EnableALiAGP
@@ -135,6 +137,8 @@
 
 static int NVreg_EnableALiAGP = 0;
 NV_MODULE_PARAMETER(NVreg_EnableALiAGP);
+MODULE_PARM_DESC(NVreg_EnableALiAGP, "Enable AGP on ALi1541/1647 chipsets "
+	"(default disabled)");
 
 /* 
  * Option: ReqAGPRate
@@ -188,7 +192,9 @@
 
 static int NVreg_NvAGP = 3;
 NV_MODULE_PARAMETER(NVreg_NvAGP);
-
+MODULE_PARM_DESC(NVreg_NvAGP, "Select which AGPGART is used if unspecified "
+	"by X - 0 (disable), 1 (use nvidia), 2 (use kernel), "
+	"3 (try 2 then 1, default)");
 
 /* 
  * Option: EnableAGPSBA
@@ -222,6 +228,7 @@
 #endif
 
 NV_MODULE_PARAMETER(NVreg_EnableAGPSBA);
+MODULE_PARM_DESC(NVreg_EnableAGPSBA, "Enable AGP Side Band Addressing");
 
 /*
  * Option: EnableAGPFW
@@ -239,13 +246,12 @@
  *
  *  0 = disable Fast Writes (default)
  *  1 = enable  Fast Writes (if supported)
- *
- * This option is disabled by default, see below for information on how
- * to enable it.
  */
 
 static int NVreg_EnableAGPFW = 0;
 NV_MODULE_PARAMETER(NVreg_EnableAGPFW);
+MODULE_PARM_DESC(NVreg_EnableAGPFW, "Enable AGP Fast Writes "
+	"(default disabled)");
 
 /*
  * Option: SoftEDIDs
@@ -265,6 +271,8 @@
 
 static int NVreg_SoftEDIDs = 1;
 NV_MODULE_PARAMETER(NVreg_SoftEDIDs);
+MODULE_PARM_DESC(NVreg_SoftEDIDs, "Enable dynamic generation of EDID info "
+	"(default enabled)");
 
 /* 
  * Option: Mobile
@@ -289,6 +297,9 @@
 
 static int NVreg_Mobile = ~0;
 NV_MODULE_PARAMETER(NVreg_Mobile);
+MODULE_PARM_DESC(NVreg_Mobile, "Select Mobile registry key when SoftEDIDs is "
+	"disabled - 0 (auto, default), 1 (Dell), 2 (Toshiba), 3 (other), "
+	"4 (Compal/Toshiba), 5 (Gateway)");
 
 
 static int NVreg_ResmanDebugLevel = ~0;
--- NVIDIA-Linux-x86-1.0-6629-pkg1/usr/src/nv/os-interface.c.orig	2004-12-05 13:54:32.544939424 +0000
+++ NVIDIA-Linux-x86-1.0-6629-pkg1/usr/src/nv/os-interface.c	2004-12-05 14:00:41.740813120 +0000
@@ -725,7 +725,8 @@
 
 static int silence_nvidia_output = 0;
 NV_MODULE_PARAMETER(silence_nvidia_output);
-
+MODULE_PARM_DESC(silence_nvidia_output, "Silence output: 0 (default, verbose) "
+	" or 1 (silent)");
 
 //
 // this is what actually outputs the data.

Index: linux-info.eclass
===================================================================
RCS file: /var/cvsroot/gentoo-x86/eclass/linux-info.eclass,v
retrieving revision 1.7
diff -u -b -B -r1.7 linux-info.eclass
--- linux-info.eclass	5 Dec 2004 12:46:58 -0000	1.7
+++ linux-info.eclass	5 Dec 2004 15:25:03 -0000
@@ -304,6 +304,15 @@
 
 	if [ -n "${error}" ] ;
 	then
+		if [ ! -z "${CONFIG_CHECK_ERROR}" ] ;
+		then
+			echo
+			IFS="$(echo -en "\n\b")"
+			for i in ${CONFIG_CHECK_ERROR}
+			do eerror ${i}
+			done
+			echo
+		fi
 		eerror "Please check to make sure these options are set correctly."
 		eerror "Once you have satisfied these options, please try merging"
 		eerror "this package again."
Index: linux-mod.eclass
===================================================================
RCS file: /var/cvsroot/gentoo-x86/eclass/linux-mod.eclass,v
retrieving revision 1.5
diff -u -b -B -r1.5 linux-mod.eclass
--- linux-mod.eclass	28 Nov 2004 09:47:31 -0000	1.5
+++ linux-mod.eclass	5 Dec 2004 15:25:03 -0000
@@ -104,6 +104,65 @@
 	echo
 }
 
+# produce /etc/modules.d file
+modconfig_generate() {
+local modulename conf i params readme numaliases opts optsexample opttext
+
+	modulename="$1"
+	
+	[ -z "$(eval echo \$\{!MODCONFIG_${modulename}_*\})" ] && return
+
+	conf="${WORKDIR}/modconf-${modulename}"
+	readme="$(eval echo \$\{MODCONFIG_${modulename}_README\})"
+	opts="$(eval echo \$\{MODCONFIG_${modulename}_OPTS\})"
+	opttext="$(eval echo \$\{MODCONFIG_${modulename}_OPTSTEXT\})"
+	optsexample="$(eval echo \$\{MODCONFIG_${modulename}_OPTSEXAMPLEONLY\})"
+	numaliases="$(eval echo \$\{#MODCONFIG_${modulename}_ALIASES[*]\})"
+
+	einfo "Installing ${modulename} module config file"
+
+	echo "# Configuration file for ${modulename} module" > ${conf}
+	echo >> ${conf}
+
+	if [ ${numaliases} > 0 ]
+	then
+		echo "# Internal aliases, do not edit" >> ${conf}
+		(( numaliases-- ))
+		for i in $(seq 0 ${numaliases})
+		do
+			echo "alias $(eval echo \$\{MODCONFIG_${modulename}_ALIASES[$i]\})" >> ${conf}
+		done
+		echo >> ${conf}
+	fi
+
+	params="$(modinfo -p ${modulename}.${KV_OBJ})"
+	if [ ! -z "${params}" ]
+	then
+		echo "# Configurable module parameters" >> ${conf}
+		[ ! -z "$readme" ] && echo "# For more details, see $readme" >> ${conf}
+		echo "#" >> ${conf}
+		
+		IFS="$(echo -en "\n\b")"
+		for i in ${params}
+		do
+			echo "#  ${i%%:*} - ${i#*:}" >> ${conf}
+		done
+		echo >> ${conf}
+	fi
+		
+	if [ ! -z "${opts}" ]
+	then
+		[ ! -z ${opttext} ] && echo "# ${opttext}" >> ${conf} \
+			|| echo "# For example:" >> ${conf}
+		[ ! -z "${optsexample}" ] && echo "#   options ${modulename} ${opts}" >> ${conf} \
+			|| echo "options ${modulename} ${opts}"  >> ${conf}
+	fi
+	
+	insinto /etc/modules.d
+	newins ${WORKDIR}/modconf-${modulename} ${modulename}
+
+}
+
 # default ebuild functions
 # --------------------------------
 
@@ -153,6 +212,8 @@
 		cd ${sourcedir}
 		insinto /lib/modules/${KV_FULL}/${moduledir}
 		doins ${modulename}.${KV_OBJ}
+		
+		modconfig_generate ${modulename}
 	done
 }
 

--
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