[U-Boot-Users] u-boot & linux kernel help on mpc860

[Wolfgang Grandegger]

>-- Original Message --
>From: Steve Gray <steve.gray at westell.co.uk>
>To: "U-Boot-Users (E-mail)" <u-boot-users at lists.sourceforge.net>
>Subject: [U-Boot-Users] u-boot & linux kernel help on mpc860
>Date: Wed, 10 Dec 2003 09:37:15 -0000
>
>
>Hi everyone.
>This is my first post onto this mailing list, so please forgive me in
>advance if i am not following the correct protocol
>with posts and such.
>
>I have u-boot working it seems almost 100%, however i have a problem with
>starting the linux kernel using bootm.
>
>I am using eldk 2.1.0 patched upto 2.2.0.
>Linux_2_4_devel cvs (snapshot 09/12/03)
>Hardware setup
>Flash Base address      0xa00000000 ->	0xa1000000 ( AMD29LV640 x2 16-bit
>wide)
>SDRAM		      	0x00000000 -> 	0x01000000 
>Serial			SMC1 @ 38k4
>Net			FEC
>
>I can tftp the uImage into RAM, then cp.b into flash. This process is fine.
>But when running the image bootm command, it seems not to continue.
>
>	## Booting image at a0100000 ...
>	   Image Name:   Linux-2.4.23
>	   Created:      2003-12-09  16:44:24 UTC
>	   Image Type:   PowerPC Linux Kernel Image (gzip compressed)
>	   Data Size:    637255 Bytes = 622.3 kB
>	   Load Address: 00000000
>	   Entry Point:  00000000
>	   Verifying Checksum ... OK
>	   Uncompressing Kernel Image ... OK
>	
>From this point everything stops. There is no more output and the console
>is
>not responding to anything
>I have what i believe to be the correct environment.
>
>	baudrate=38400
>	ethaddr=00:a0:13:00:0a:8c
>	preboot=echo;echo
>	clocks_in_mhz=1
>	kernel_addr=a0100000
>	bootargs=root=/dev/nfs rw nfsroot=$(serverip):$(rootpath)
>ip=$(ipaddr):$(serveri
>	p):$(gatewayip):$(netmask):$(hostname)::off
>	bootcmd=bootm a0100000
>	filesize=9b949
>	ipaddr=168.10.10.6
>	serverip=168.10.1.240
>	stdin=serial
>	stdout=serial
>	stderr=serial
>
>	Environment size: 340/4092 bytes
>
>I have a number of questions about the interaction with u-boot and the
>kernel, which i am hoping can be answered.
>
>Does the kernel require configuration for custom hardware ? By custom
>hardware i mean not an off shelf the standard development board.
>How does the kernel find out the flash base address. serial port is running
>at 38k4 on smc1, the FEC is to be used. IP address etc etc ?

This depends on the actual hardware. Parameters like IP address,
flash base address or baudrate are passed via info structure to 
Linux, basically what is listed with "=> bdinfo". Serial ports
and ethernet configuration is defined via Linux kernel parameters 
(make config).

Wolfgang.