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-rw-r--r--Documentation/dell_rbu.txt18
1 files changed, 13 insertions, 5 deletions
diff --git a/Documentation/dell_rbu.txt b/Documentation/dell_rbu.txt
index bcfa5c35036b..95d7f62e4dbc 100644
--- a/Documentation/dell_rbu.txt
+++ b/Documentation/dell_rbu.txt
@@ -13,6 +13,8 @@ the BIOS on Dell servers (starting from servers sold since 1999), desktops
13and notebooks (starting from those sold in 2005). 13and notebooks (starting from those sold in 2005).
14Please go to http://support.dell.com register and you can find info on 14Please go to http://support.dell.com register and you can find info on
15OpenManage and Dell Update packages (DUP). 15OpenManage and Dell Update packages (DUP).
16Libsmbios can also be used to update BIOS on Dell systems go to
17http://linux.dell.com/libsmbios/ for details.
16 18
17Dell_RBU driver supports BIOS update using the monilothic image and packetized 19Dell_RBU driver supports BIOS update using the monilothic image and packetized
18image methods. In case of moniolithic the driver allocates a contiguous chunk 20image methods. In case of moniolithic the driver allocates a contiguous chunk
@@ -22,8 +24,8 @@ would place each packet in contiguous physical memory. The driver also
22maintains a link list of packets for reading them back. 24maintains a link list of packets for reading them back.
23If the dell_rbu driver is unloaded all the allocated memory is freed. 25If the dell_rbu driver is unloaded all the allocated memory is freed.
24 26
25The rbu driver needs to have an application which will inform the BIOS to 27The rbu driver needs to have an application (as mentioned above)which will
26enable the update in the next system reboot. 28inform the BIOS to enable the update in the next system reboot.
27 29
28The user should not unload the rbu driver after downloading the BIOS image 30The user should not unload the rbu driver after downloading the BIOS image
29or updating. 31or updating.
@@ -42,9 +44,11 @@ In case of packet mechanism the single memory can be broken in smaller chuks
42of contiguous memory and the BIOS image is scattered in these packets. 44of contiguous memory and the BIOS image is scattered in these packets.
43 45
44By default the driver uses monolithic memory for the update type. This can be 46By default the driver uses monolithic memory for the update type. This can be
45changed to contiguous during the driver load time by specifying the load 47changed to packets during the driver load time by specifying the load
46parameter image_type=packet. This can also be changed later as below 48parameter image_type=packet. This can also be changed later as below
47echo packet > /sys/devices/platform/dell_rbu/image_type 49echo packet > /sys/devices/platform/dell_rbu/image_type
50Also echoing either mono ,packet or init in to image_type will free up the
51memory allocated by the driver.
48 52
49Do the steps below to download the BIOS image. 53Do the steps below to download the BIOS image.
501) echo 1 > /sys/class/firmware/dell_rbu/loading 541) echo 1 > /sys/class/firmware/dell_rbu/loading
@@ -53,9 +57,13 @@ Do the steps below to download the BIOS image.
53 57
54The /sys/class/firmware/dell_rbu/ entries will remain till the following is 58The /sys/class/firmware/dell_rbu/ entries will remain till the following is
55done. 59done.
56echo -1 > /sys/class/firmware/dell_rbu/loading 60echo -1 > /sys/class/firmware/dell_rbu/loading.
57
58Until this step is completed the drivr cannot be unloaded. 61Until this step is completed the drivr cannot be unloaded.
62If an user by accident executes steps 1 and 3 above without executing step 2;
63it will make the /sys/class/firmware/dell_rbu/ entries to disappear.
64The entries can be recreated by doing the following
65echo init > /sys/devices/platform/dell_rbu/image_type
66NOTE: echoing init in image_type does not change it original value.
59 67
60Also the driver provides /sys/devices/platform/dell_rbu/data readonly file to 68Also the driver provides /sys/devices/platform/dell_rbu/data readonly file to
61read back the image downloaded. This is useful in case of packet update 69read back the image downloaded. This is useful in case of packet update