[G1 Android Development] daproy:
The original thread troubleshooting and creating this patch can be found here

Kernel source for the boot.img I post here can be found here. The patch is here.

Discussion on whether to include this in future Cyanogen Mods can be found here

By modifying the memory map in the kernel we are able to increase the amount of usable linux memory by 10MB bringing the mapped LINUX ram to 110MB (minus kernel used memory making it around 107MB).

The patch moves the ram console and framebuffer memory to SMI on chip and changes the GPU1 ram from 8MB to 0MB. GPU0 still has 7MB mapped in SMI so only 3D intensive applications and games seem to suffer after this patch. The benefit is more RAM memory for linux to use. Several people have reported system performance improvements at the sacrifice of 3D graphics applications.

Note: you will not see extra ram under in recovery since it uses it's own (unpatched) kernel to boot.

CM 4.2.14.1 CFS boot.img

MD5SUM fd12d3635858d1da00e2590566b73564

http://www.mediafire.com/?aydmodmkdqk

http://www.sendspace.com/file/uqcy2e

CM 4.2.13 CFS boot.img by pershoot

http://rapidshare.com/files/334987707/boot-4213-dp_mem.zip

http://www.sendspace.com/file/9dvmvi

CM 4.2.13 CFS boot.img

MD5SUM be744f56306f1733ccabe48d4c8c974e

http://www.mediafire.com/?1hnzmnmfw2j

http://www.sendspace.com/file/t0sdkx

CM 4.2.13 BFS-313 boot.img

MD5SUM a82f08a68ec393f0d8bee416588d5b16

http://www.mediafire.com/?xwkeoidw52z

http://www.sendspace.com/file/2nmh6a

CM 4.2.12.2 CFS boot.img

MD5SUM 27601954b73c857ff6b70d112667ca69

http://www.mediafire.com/?ouzmzygguxz

CM 4.2.12.2 BFS-313 boot.img

MD5SUM c8d6a1aa4ad853406b3dd4bb683e043d

http://www.mediafire.com/?5noz0njajiz

CM 4.2.11.1 BFS-313 boot.img with ext fix

MD5SUM 70a1ce95a9017de62d7276a84e58e804

http://www.mediafire.com/?nodemj2xnet

CM 4.2.11.1 BFS-313 boot.img

MD5SUM 7fe910461d09d84b1a856de926e29311

http://www.mediafire.com/?z5tnmnmg4rq

CM 4.2.11.1 CFS boot.img

MD5SUM a5b229fc4704b8dbb1c12af170fd95e1

http://www.mediafire.com/?yyxzmyewjtq

CM 4.2.9.1 BFS-311 boot.img

MD5SUM 0582eb144c761d46fd097960ab9ce2c5

http://www.mediafire.com/?djvmmkozzkz

CM 4.2.9.1 CFS boot.img

MD5SUM 45fee1ab029af69a521ddae2f7c36f91

http://www.mediafire.com/?nm2mnmdyiwu

CM 4.2.9 CFS boot.img by dumfuq

http://www.mediafire.com/?zmdmhjmyzjy

CM 4.2.8 BFS-311 boot.img

http://www.mediafire.com/?fm1yngfm4fz

MD5SUM 72e990cf1bdeb9cc2e2c61f658fbc0dd

CM 4.2.8 CFS boot.img

http://www.mediafire.com/?xlwwmlzny2n

MD5SUM 9157e804c101bc41e4d4ce93f4466543

CM 4.2.7.1 BFS-311 boot.img

http://www.mediafire.com/?2mjywndydz1

MD5SUM 6a19bb778e912ef2ec8d53a2cbd4305e

CM 4.2.7.1 CFS boot.img by dwang

http://drop.io/f2hwhjz#

CM 4.2.6 BFS-311 boot.img

http://www.mediafire.com/?djmrreijnzk

MD5SUM bd4fc8d8bb25f326bcfa08fa30c1199d

CM 4.2.6 CFS boot.img

http://www.mediafire.com/?uzbnnmz124j

MD5SUM a7f8d6882abc9d583abe1aff46f8656b

CM 4.2.6 CFS boot.img by dumfuq

http://www.mediafire.com/?2gtjwngtydn

CM 4.2.5 CFS boot.img by dwang

http://drop.io/ga5vgpk#

CM 4.2.4 CFS boot.img

http://www.mediafire.com/?ndmjkk2zmga

MD5SUM 9672701c93db85da3e98755a7c12eb3d

CM 4.2.3.1 CFS boot.img

http://www.mediafire.com/?tzdnyjyg4iq

MD5SUM e874ada3f78fb709814e7e65ebc1e7f3

CM 4.2.1 BFS-304 boot.img

http://www.mediafire.com/?2znaudyduy3

MD5SUM 8c0e51737dc19ed192572b2f51c99bca

CM 4.2.1 CFS boot.img

http://www.mediafire.com/?tm5jbqv1ouf

MD5SUM eb7107ebb2025ce517b1af308de2fb28

CM 4.1.9999 BFS-304 boot.img

http://www.mediafire.com/?emeyhmzmqiz

MD5SUM c3f76045c7737d99f50518cb912f0f08

CM 4.1.999 BFS-303 boot.img packed by statickaos

https://home.statickaos.net/public/boot-new.img

CM 4.1.99 BFS-303 boot.img

http://www.mediafire.com/?nnk2mtiuioi

MD5SUM 8b11ace91c745138cde58b4bd1d7848a

CM 4.1.99 BFS-302 boot.img

http://www.mediafire.com/?ndwmmw2ti2y

MD5SUM 80cda08de15da8af824ffcb665c21c2f

CM 4.1.99 BFS-300 boot.img

http://www.mediafire.com/?mtlujofbkml

MD5SUM bc8c356d1b97c7c0ebc46c50a03b9eaa

CM 4.1.11.1 BFS-302 boot.img

MD5SUM 9d7f189db371ac3cc8ac7845d513be50

http://www.mediafire.com/?emzyyk5zwve

CM 4.1.11.1 BFS-300 boot.img

MD5SUM ab8978a92436f600ecd05fbf7ddbf027

http://www.mediafire.com/?yztwczjnzgo

CM 4.1.11.1 kernel boot.img

MD5SUM 9e49829ad466b2f3adf9402bcba9c9c0

http://www.mediafire.com/?dvwmwyit4yn

http://drop.io/mempatch

CM 4.1.11.1 kernel with CFS instead of BFS boot.img (by dumfuq only for Dream)

http://www.mediafire.com/?nzyg1f4jniu

CM 4.0.4 kernel boot.img (by dumfuq only for Dream)

http://www.mediafire.com/?12xboktlldj

HTC sourced kernel (by cyrowski and jac)

http://xdaforums.com/showthread.php?t=534479

Stock Android 1.6 Kernel (by dwang)

http://xdaforums.com/showthread.php?t=566676

Installation Instructions where boot.img is the name of the boot.img you download

As suggested by IConrad01 it is advisable to test a new boot.img before flashing it with:

fastboot boot boot.img

Make a nandroid backup before installing or download the stock boot.img to go back.

Fastboot Install

fastboot flash boot boot.img
fastboot reboot

Terminal Emulator Install

Copy the boot.img to the root of your sdcard. Then issue these commands from the terminal emulator.

su
flash_image boot /sdcard/boot.img
reboot

Check Linux Memory from Terminal Emulator

free or cat /proc/meminfo

Check Linux Memory from ADB

adb shell free or adb shell cat /proc/meminfo

Obviously, there is still room for improvement with this patch. Currently working on getting GPU1 RAM moved to SMI successfully and potentially accessing another 18MB of RAM if the specs on EBI memory are correct (128MB). Any ideas?