增加kernel 設定和找SPI flash

週末趁著有高速電腦可以用趕快編kernel，
加了下列幾項

== System type

==== Timer and clock configuration  --->

Tickless System (Dynamic Ticks)

==== CPU Frequency scaling  --->

======Default CPUFreq governor

defautl scaling governor: conservative

'conservative' cpufreq governor

STMicroelectronics CPU Frequency driver

==Power management options

==== Power Management support

Power Management support

Suspend to RAM and standby (NEW)

Run-time PM core functionality (NEW)

CPU idle PM support

自動調整CPU頻率生效了，
# cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq
56250
不過我比較想要用 Ondemand governor，
有工作就馬上用全力處理完再來休息。



另外一個就是要測試載入UFW 防火牆程式的IPv6

==Networking support

==== The IPv6 protocol  --->

<M>   IPv6: IPsec transport mode (NEW)

<M>   IPv6: IPsec tunnel mode (NEW)

<M>   IPv6: IPsec BEET mode (NEW)

<M>   IPv6: IPv6-in-IPv4 tunnel (SIT driver) (NEW)

====Network packet filtering framework (Netfilter)  --->

Advanced netfilter configuration

====== IP: Netfilter Configuration

<*> IP tables support (required for filtering/masq/NAT)

<M>   "addrtype" address type match support

<M>   "ecn" match support

<M>   "ttl" match support

<M>   Packet filtering

<M>     REJECT target support

<M>   LOG target support

<M>   ULOG target support

<M>   Packet mangling

<M>     ECN target support

<M>   "TTL" target support

<M>   raw table support (required for NOTRACK/TRACE)

====== IPv6: Netfilter Configuration  --->

<M> IP6 tables support (required for filtering)

項目內filter選項全部設定成Modules

結果還是出現錯誤

# ufw enable

Command may disrupt existing ssh connections. Proceed with operation (y|n)? y

ERROR: problem running ufw-init

modprobe: module nf_conntrack_ftp not found in modules.dep

modprobe: module nf_nat_ftp not found in modules.dep

modprobe: module nf_conntrack_netbios_ns not found in modules.dep

iptables-restore: line 4 failed

iptables-restore: line 69 failed

iptables-restore: line 36 failed

ip6tables-restore: line 4 failed

ip6tables-restore: line 65 failed

ip6tables-restore: line 33 failed
之後可能先找找能不能在編ufw時取消對IPv6支援，
雖然說現在很多骨幹都已經切換到IPv6了。

另外上加減測了掛ISO檔案，
顯示無 loop device，
就多加了下面這些
== Device Drivers

==== Block devices  --->

<M>   Loopback device support

== File systems

CD-ROM/DVD Filesystems  --->

<*> ISO 9660 CDROM file system support

[*]   Microsoft Joliet CDROM extensions

一開始在 /dev 下沒看到 loop 裝置，
原來是我編成modules 還沒載入， 
# insmod /lib/modules/[kernel version]/kernel/drivers/block/loop.ko
之後就可以正常使用
# mount -t iso9660 -o loop [iso file] [mount dir]

最後是最主要的SPI flash

== Device Drivers

==== Memory Technology Device (MTD) support

====== Self-contained MTD device drivers  --->

Support most SPI Flash chips (AT26DF, M25P, W25X, ...) (NEW)

ST Microelectronics SPI-FSM Serial Flash Controller

====SPI support

STMicroelectronics SPI SSC-based driver (NEW)

User mode SPI device driver support (NEW)

結果只看到
/sys/bus/spi/drivers/m25p80
表示有driver，
可是 /sys/bus/spi/devices 內是空的，
也就是沒有抓到裝置，
當然也沒有 /dev/mtd 了。
可能要參考下面的 patch 方式增加platform-devicehttp://arago-project.org/git/projects/?p=linux-davinci.git;a=shortlog;h=refs/heads/davinci-spi-rewrite

platform-device 我想先增加的是reset按鈕和LED。

現在用的kernel 2.6.32.59都要感謝 網樂通改機俱樂部Chia-Cheng Huang 釋出。