Recently whao (member of this forum) stated, that ASUS shipped CD with his wl500gx unit, containing GPL sources for 1.8.1.9 firmware and was kind enough to provide me a download link, So I've downloaded them (258MB) and performed comparisions with 1.8.1.7.
The changes are:
Code:
 et.4702/sys/etc.c                                              |    5
 et.4702/sys/etc47xx.c                                          |    4
 linux/linux/drivers/usb/printer.c                              |   19 ++
 router/LPRng/src/common/lpd.c                                  |   65 +++++-----
 router/LPRng/src/include/lp.h                                  |    3
 router/Makefile                                                |    1
 router/httpd/variables.c                                       |   18 +-
 router/mipsel-uclibc/version.conf                              |    2
 router/rc/services_ex.c                                        |    4
 router/rcamdmips/rcamd.c                                       |   22 ++-
 router/shared/flash.default                                    |    4
 router/www/asus/mkweb                                          |    9 +
 router/www/asus/web_asus_en/Advanced_QOS_Content.asp           |    7 -
 router/www/asus/web_asus_en/Advanced_VirtualServer_Content.asp |    4
 router/www/asus/web_asus_en/Basic_GOperation_Content.asp       |    2
 router/www/asus/web_asus_en/Basic_ROperation_Content.asp       |    2
 router/www/asus/web_asus_en/general.js                         |   37 ++++-
 router/www/asus/web_asus_tw/Advanced_QOS_Content.asp           |    7 -
 router/www/asus/web_asus_tw/Advanced_VirtualServer_Content.asp |    4
 router/www/asus/web_asus_tw/general.js                         |   37 ++++-
 20 files changed, 174 insertions(+), 82 deletions(-)
I've made patches against GPL 1.8.1.7 sources available here. Apply them on the top of 1.8.1.7 tree if you want to have 1.8.1.9 sources. These patches does not contain newely added CN localized pages.