the question of the starting of uclinux by u-boot

hi Scott:

i remake the kernel by the microtronic cyclone development board and the microtronic psk development board. but, the problem is same to the before.

the output:

==> bootm 00040000# # Booting image at 00040000 ...

Image Name: Linux Kernel Image

Image Type: Nios-II Linux Kernel Image (gzip compressed)

Data Size: 460103 Bytes = 449.3 kB

Load Address: 00800000

Entry Point: 00800000

Verifying Checksum ... OK

Uncompressing Kernel Image ... OK

cursor winke( halt )

Because my sdram is 16 bits in my development board. but, the sdram is 32 bits in the altera and microtronic. maybe it be the problem? how to solve it ?

i want to know how to modify settings the kernel of uclinux or the other good mothed.

1. maybe you should check the hardware of your board in more details.

you should run from onchip memory and do a lot of sdram tests, and check the timing/functionality of your board.

2. if you want to run uclinux, it is better to use S-core, with a small icache, eg 512Bytes.

the E-core is too slow. If you use CycloneII, use hw mul.

3. you can use initramfs with the kernel. so that you need only one kernel image to boot, instead of three. After you are comfortable with uClinux, you can try compressed loader then.

Hi lucky,

This is very strange -- I've been using u-boot for quite some time without any major

problems ... so a few more questions ... I'm sure we'll eventually figure this out:

1. Where did you get the u-boot source code, and when?

2. Did you enable the JTAG UART in u-boot? i.e. -- are you using the JTAG UART

for both u-boot and the kernel ... or are you using a serial UART for u-boot and

the JTAG UART for the kernel?

Also, please try the following with an uncompressed u-boot image file:

-- Program the image to flash as you normally do: @ 0004_0000

-- Post the output of u-boot command:

==> md.l 00400040 8

-- Tell us what happens when you try this from the u-boot prompt:

==> go 00040040

This will jump directly to the kernel entry point in flash for an uncompressed image

file (the u-boot header is 0x40 bytes long; the kernel binary immediately follows

the kernel. Doing this will force the kernel to relocate itself.

Regards,

--Scott

hi, scott: (thank you very much for your help)

"1. Where did you get the u-boot source code, and when?"

i am a friend with liangYi. my u-boot is sent to me from liangYi. and liangYi's u-boot is sent to him from you. about in october 2005.

"2. Did you enable the JTAG UART in u-boot? i.e. -- are you using the JTAG UART

for both u-boot and the kernel ... or are you using a serial UART for u-boot and

the JTAG UART for the kernel?"

i can use a serial UART for u-boot, but can not use the JTAG UART for the kernel,because i have not startupped the kernel.

"3. Also, please try the following with an uncompressed u-boot image file:

-- Program the image to flash as you normally do: @ 0004_0000

-- Post the output of u-boot command:"

the output:

U-Boot 1.1.3 (Jan 3 2006 - 10:17:49)

CPU : Nios-II

SYSID : d4a9fbb0, Mon Dec 19 06:36:32 2005

BOARD : Altera EP-1C6

*** Warning - bad CRC, using default environment

==> md.l 00400040 8

00400040: 197fff26 002ee03a 00005206 003ff506 &...:....R....?.

00400050: 002ee03a 00003206 203ee83a 003fff06 :....2..:.> ..?.

==> go 00040040# # Starting application at 0x00040040 ...

(cursor winking in windows and program halt)

Hi lucky,

Just to be sure I understand:

-- You configured u-boot to use the serial UART, and

-- You configured the kernel to use the JTAG UART.

Yes?

--Scott

hi scott:

i have already solved the problem. it is startupping the kernel.

in the past :

-- I configured u-boot to use the serial UART, and

-- I configured the kernel to use the JTAG UART.

now :

-- I configur u-boot to use the serial UART, and

-- I configur the kernel to use the UART.

thank you very much for your help!

the other question is:

U-Boot 1.1.3 (Jan 3 2006 - 10:17:49)

CPU : Nios-II

SYSID : d4a9fbb0, Mon Dec 19 06:36:32 2005

BOARD : Altera EP-1C6

*** Warning - bad CRC, using default environment

why is the "bad CRC"?

how to setting environment variety, the problem of "bad CRC" can be solved?