Lonsn,
I am the maintainer of CSB272 port of U-Boot. I've done the port based on technical info of the board which is not very reliable. Unfortunately, Cogent generally is not very responsive to emails regarding the ambiguous/outdated technical information about their boards.
Some information is extracted by using BDI2000 after uMon intitialized the hardware. Some information is based on datasheet of the parts.
This is actually a discontinued board. In our application here, we do not use the Epson controller. We have switched to using CSB472 now which is smaller and does not have the parts we do not use.
On 8 Sep 2004 at 22:23, Lonsn wrote:
then bootm, kernel panic at init EPSON1356 Display Controller, so I reset U-BOOT, I download kernel again
To me it sounds like your Epson1356 driver issue in Linux kernel. You should debug the driver to find out what exactly within the driver is causing the panic.
Check the assumptions made by the driver. The particular driver may be assuming that bootloader is doing a particular initialization however a well written driver should not assume these and re- inititialize the hardware suitably. It could also be a race condition or an uninitialized variable.
When I disabled framebuffer support in kernel, then every time booting linux is ok. I used another bootloader uMon and enabled framebuffer support in kernel,every time booting linux is ok. I have changed bd_t struct in kernel, then it is the same as in U-BOOT, undefined CFG_CLK_Mhz, I compiled U-BOOT with csb272_config.
Obviously bd_t structure should match between kernel and U-Boot. You can comment bd_t definition and include "ppcboot.h" instead for U-Boot compatible version.
Should I pay attention to SDRAM init sequence in U-BOOT as Wolfgang has said many times?
As far as I know SDRAM initialization for CSB272 is correct. The information supplied by Cogent in the tech. documentation is for 32MB SDRAM (older) version of the board but your and my board are 64MB.
*** Warning - bad CRC, using default environment
Why didn't you do a "saveenv" so default environment would be written. You've should set ethaddr variable in environment for networking to work correctly.
Best regards, Tolunay