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Info
  
Name-Collision - multiple objects in this wiki use the name cefdk!
cefdk (chipcmd) Upgrade CEFDK image file.
cefdk (partition) Intel CEFDK partition on Puma6 models.

Linux-Partition

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Details

cefdk is the 512 KB Intel CEFDK partition on Puma6 models.

CEFDK is the abbreviation for Consumer Electronics Firmware Development Kit.

Intel(R) Consumer Electronics Firmware Development Kit (Intel(R) CEFDK)
Copyright (C) 1999-2012 Intel Corporation. All rights reserved.

It is a 3 stage Bootloader started on the ARM of the Puma6. Note that the Puma5 by TI only had an ARM.
The entire DOCSIS stack was written for ARM and Intel added the ATOM as an APP-CPU after they bought Puma5.
This means the entire story starts on ARM, the NP-CPU and the ATOM was not really needed.

Stage1 (64 KB) initializes and tests the hardware and creates and tests an APPCPU-NPCPU Mailbox.
A Mailbox is an asynchronous Inter-CPU communication mechanism widely used in embedded systems.
Once the ATOM is known to be alive the Stage2 signature is tested and launched on success.

Stage2 (37 KB) verifies some settings and fuses and tests tge Stage3 signature and launches it on success.

Stage3 (405 KB) contains the real magic. It contains the main CEFDK part and the EVA for the ARM merged into it.
EVA for ATOM is on the 128 KB urlader partition.

See also the cefdk (chipcmd) updater for this partition.

Splitting

According to the bootparams it consists of 6 parts summing up to 512 KB:

 CEFDK S1 Offset ..............  0x00000000
 CEFDK S1 Size ................  0x00010000 -  64 KB
 CEFDK S2 Offset ..............  0x00010000
 CEFDK S2 Size ................  0x00009400 -  37 KB
 CEFDK S3 Offset ..............  0x00019400
 CEFDK S3 Size ................  0x00065400 - 405 KB
 CEFDK S1H Offset .............  0x0007F000
 CEFDK S1H Size ...............  0x00000800 -   2 KB
 CEFDK S2H Offset .............  0x0007F800
 CEFDK S2H Size ...............  0x00000800 -   2 KB
 CEFDK S3H Offset .............  0x0007E800
 CEFDK S3H Size ...............  0x00000800 -   2 KB

Let's split it:

# dd if=mtd4.bin of=cefdk_s1.bin bs=256 skip=$((0x000000)) count=$((0x000100))
# dd if=mtd4.bin of=cefdk_s2.bin bs=256 skip=$((0x000100)) count=$((0x000094))
# dd if=mtd4.bin of=cefdk_s3.bin bs=256 skip=$((0x000194)) count=$((0x000654))
# dd if=mtd4.bin of=cefdk_s1h.bin bs=256 skip=$((0x0007F0)) count=$((0x000008))
# dd if=mtd4.bin of=cefdk_s2h.bin bs=256 skip=$((0x0007F8)) count=$((0x000008))
# dd if=mtd4.bin of=cefdk_s3h.bin bs=256 skip=$((0x0007E8)) count=$((0x000008))

# ls -lh cefdk*

-rw-r--r--    1 root     users      64.0K Nov 24 00:00 cefdk_s1.bin
-rw-r--r--    1 root     users       2.0K Nov 24 00:05 cefdk_s1h.bin
-rw-r--r--    1 root     users      37.0K Nov 24 00:02 cefdk_s2.bin
-rw-r--r--    1 root     users       2.0K Nov 24 00:06 cefdk_s2h.bin
-rw-r--r--    1 root     users     405.0K Nov 24 00:04 cefdk_s3.bin
-rw-r--r--    1 root     users       2.0K Nov 24 00:07 cefdk_s3h.bin

Analyzing

File does not find anything:

# file cefdk*

cefdk_s1.bin:  data
cefdk_s1h.bin: data
cefdk_s2.bin:  data
cefdk_s2h.bin: data
cefdk_s3.bin:  data
cefdk_s3h.bin: data

Stage 3 405.0K cefdk_s3.bin is the blob of interest:

# binwalk cefdk_s3.bin

DECIMAL       HEXADECIMAL     DESCRIPTION
--------------------------------------------------------------------------------
51004         0xC73C          JFFS2 filesystem, little endian
380259        0x5CD63         Copyright string: "Copyright (C) 1999-2012 Intel Corporation. All rights reserved."
387216        0x5E890         CRC32 polynomial table, little endian
388524        0x5EDAC         Copyright string: "Copyright 2005 AVM Date: %s Time: %s "
389972        0x5F354         CRC32 polynomial table, little endian

It obviously contains EVA:

# strings cefdk_s3.bin | grep EVA

[%s] DOCSIS already running, Leaving EVA!
[%s] No valid default-config found in ARM image, Leaving EVA!
(AVM) EVA Revision: %s Version: %d
Leaving EVA, starting DOCSIS!
215 AVM EVA Version %d.%s 0x%x 0x%x%s

Source

rst@weed:~/tftp/arm$ strings cefdk_s3*.bin | grep '\.c$'

8254.c           # Programmable Interval Timer
8259.c           # Programmable Interrupt Controller
addr_map.c
ce2600_ata.c     # Atom Processor CE 2600
kbd_mgr.c        # 8051 Keyboard Microcontroller 
pci_alloc.c
straps.c

Dependencies

Daily updated index of all dependencies of this partition. Last update: GMT.
A * in the Mod column marks info from Supportdata-Probes, which will always stay incomplete.
A ** in the Mod column marks info from Supportdata2 probes, which by their nature will stay way more incomplete.
A - in the Mod column marks manual research, the Firmware then shows where the item occurs, not the Relation.

Relation Typ Object Mod Firmware Info Origin
0 dependencies for this partition

Model-Matrix

Daily updated index of the presence, path and size of this partition for each model. Last update: 2024-11-14 07:01 GMT.
Showing all models using this partition. Click any column header (click-wait-click) to sort the list by the respective data.
The (main/scrpn/boot/arm/prx/atom/rtl) label in the Model column shows which CPU is meant for Multi-Linux models.
Note that this list comes from Supportdata-Probes, which can have arbitrary settings and come from different firmware versions.
It doesn't say much if a model is not listed here. It may be a missing supportdata file or just a disabled feature.

Missing Supportdata

The data in this article is incomplete due to missing Supportdata-Probes for the models listed below.
If you own any of these models and would like to help then please get in touch.

SMW-Browser

Information is currently being retrieved from the backend.