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Re: [PATCH 2/2] MIPS: Add defconfig for Loongson1B (UPDATED)

To: keguang.zhang@gmail.com
Subject: Re: [PATCH 2/2] MIPS: Add defconfig for Loongson1B (UPDATED)
From: wu zhangjin <wuzhangjin@gmail.com>
Date: Sun, 25 Sep 2011 12:41:59 +0800
Cc: linux-mips@linux-mips.org, linux-kernel@vger.kernel.org, ralf@linux-mips.org, r0bertz@gentoo.org, chenj@lemote.com
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On Sat, Sep 24, 2011 at 2:21 PM,  <keguang.zhang@gmail.com> wrote:
> From: Kelvin Cheung <keguang.zhang@gmail.com>
>
> This patch adds defconfig for Loongson1B.
>
> Signed-off-by: Kelvin Cheung <keguang.zhang@gmail.com>
> ---
>  arch/mips/configs/ls1b_defconfig |   95 
> ++++++++++++++++++++++++++++++++++++++
>  1 files changed, 95 insertions(+), 0 deletions(-)
>  create mode 100644 arch/mips/configs/ls1b_defconfig
>
> diff --git a/arch/mips/configs/ls1b_defconfig 
> b/arch/mips/configs/ls1b_defconfig
> new file mode 100644
> index 0000000..f7c48f5
> --- /dev/null
> +++ b/arch/mips/configs/ls1b_defconfig
> @@ -0,0 +1,95 @@
> +CONFIG_MACH_LOONGSON1=y
> +CONFIG_HIGH_RES_TIMERS=y
> +CONFIG_PREEMPT_VOLUNTARY=y

What is the target market of 1B?

Seems CONFIG_PREEMPT_VOLUNTARY is for Desktop, CONFIG_PREEMPT is
better for low-latency desktop
and even for some real time applications.

> +CONFIG_KEXEC=y

Did you validate kexec support on your 1B board?

According to my previous experiment, The kexec support of 32bit
Loongson2F requires more patches,
those patches are available in the following git repo:

http://dev.lemote.com/cgit/linux-loongson-community.git/log/?h=tiny36

or

git://dev.lemote.com/linux-loongson-community.git tiny36

> +# CONFIG_SECCOMP is not set
> +CONFIG_EXPERIMENTAL=y
> +# CONFIG_LOCALVERSION_AUTO is not set
> +CONFIG_SYSVIPC=y
> +CONFIG_BSD_PROCESS_ACCT=y
> +CONFIG_BSD_PROCESS_ACCT_V3=y
> +CONFIG_IKCONFIG=y
> +CONFIG_IKCONFIG_PROC=y
> +CONFIG_LOG_BUF_SHIFT=16
> +CONFIG_BLK_DEV_INITRD=y
> +CONFIG_RD_BZIP2=y
> +CONFIG_RD_LZMA=y
> +CONFIG_RD_XZ=y
> +CONFIG_RD_LZO=y

Not sure why you need all of these 4 compression algorithms, LZO is
the fastest one, LZMA has the largest compression ratio.

> +CONFIG_EXPERT=y
> +CONFIG_KALLSYMS_ALL=y
> +CONFIG_PERF_EVENTS=y
> +# CONFIG_COMPAT_BRK is not set
> +CONFIG_MODULES=y
> +CONFIG_MODULE_UNLOAD=y
> +CONFIG_MODVERSIONS=y
> +# CONFIG_LBDAF is not set
> +# CONFIG_BLK_DEV_BSG is not set
> +# CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS is not set
> +# CONFIG_SUSPEND is not set
> +CONFIG_NET=y
> +CONFIG_PACKET=y
> +CONFIG_UNIX=y
> +CONFIG_INET=y
> +CONFIG_IP_PNP=y
> +CONFIG_IP_PNP_DHCP=y
> +CONFIG_SYN_COOKIES=y
> +# CONFIG_INET_XFRM_MODE_TRANSPORT is not set
> +# CONFIG_INET_XFRM_MODE_TUNNEL is not set
> +# CONFIG_INET_XFRM_MODE_BEET is not set
> +# CONFIG_INET_DIAG is not set
> +# CONFIG_IPV6 is not set
> +# CONFIG_WIRELESS is not set
> +CONFIG_UEVENT_HELPER_PATH="/sbin/hotplug"
> +CONFIG_DEVTMPFS=y
> +CONFIG_DEVTMPFS_MOUNT=y
> +# CONFIG_STANDALONE is not set
> +CONFIG_BLK_DEV_LOOP=y
> +# CONFIG_INPUT_MOUSEDEV is not set
> +# CONFIG_INPUT_KEYBOARD is not set
> +# CONFIG_INPUT_MOUSE is not set
> +# CONFIG_SERIO is not set
> +CONFIG_VT_HW_CONSOLE_BINDING=y
> +CONFIG_LEGACY_PTY_COUNT=8
> +# CONFIG_DEVKMEM is not set
> +CONFIG_SERIAL_8250=y
> +CONFIG_SERIAL_8250_CONSOLE=y
> +CONFIG_SERIAL_8250_RUNTIME_UARTS=1
> +# CONFIG_HW_RANDOM is not set
> +CONFIG_RAMOOPS=y
> +# CONFIG_HWMON is not set
> +# CONFIG_MFD_SUPPORT is not set
> +# CONFIG_VGA_CONSOLE is not set
> +# CONFIG_HID_SUPPORT is not set
> +# CONFIG_USB_SUPPORT is not set
> +# CONFIG_IOMMU_SUPPORT is not set
> +CONFIG_EXT2_FS=y
> +CONFIG_EXT2_FS_XATTR=y
> +CONFIG_EXT2_FS_POSIX_ACL=y
> +CONFIG_EXT2_FS_SECURITY=y
> +CONFIG_EXT3_FS=y
> +CONFIG_EXT3_FS_POSIX_ACL=y
> +CONFIG_EXT3_FS_SECURITY=y

Seems we have EXT4 now, but PMON may not support it currently ;)

> +# CONFIG_DNOTIFY is not set
> +CONFIG_PROC_KCORE=y
> +CONFIG_TMPFS=y
> +CONFIG_TMPFS_POSIX_ACL=y
> +# CONFIG_MISC_FILESYSTEMS is not set
> +# CONFIG_NETWORK_FILESYSTEMS is not set
> +# CONFIG_ENABLE_WARN_DEPRECATED is not set
> +# CONFIG_ENABLE_MUST_CHECK is not set
> +CONFIG_UNUSED_SYMBOLS=y
> +CONFIG_DEBUG_FS=y
> +CONFIG_DETECT_HUNG_TASK=y
> +CONFIG_SCHEDSTATS=y
> +CONFIG_TIMER_STATS=y
> +CONFIG_DEBUG_INFO=y
> +CONFIG_DEBUG_MEMORY_INIT=y
> +CONFIG_BOOT_PRINTK_DELAY=y
> +CONFIG_SYSCTL_SYSCALL_CHECK=y
> +# CONFIG_FTRACE is not set
> +CONFIG_KGDB=y
> +CONFIG_KGDB_LOW_LEVEL_TRAP=y
> +CONFIG_KGDB_KDB=y

If this config is for product, the above debug support may be not required.

Best Regards,
Wu Zhangjin

> +CONFIG_KDB_KEYBOARD=y
> +# CONFIG_EARLY_PRINTK is not set
> --
> 1.7.4.1
>
>

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