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Altera_Forum's avatar
Altera_Forum
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20 years ago

download kernel into ram by u-boot

hello! I want to download the kernel to the sdram by u-boot. how can I use the tftp in u-boot? help me! thank you for all response!
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
19 years ago

Hi smcnutt,

We finished the net device(dm9000a) driver in u-boot. And debuging tftpboot

1.

=>tftpboot 01500000 vmlinux.img

// SDRAM base address: 0100 0000

// SDRAM size : 0100 0000 (16MB)

After succesfully download the vmlinux.img, U-boot can't return to "console" state(cannot get '==>') ? We cannot type "bootm" command.

2.

in <u-boot>/net/net.c L:528

Before 
switch (NetState) {....
, We add 

printf(" T T T ");
,

the result is that the net speed is faster than before.

We guess the reason is that:

u-boot send a "request";printf() add a little delay to meet u-boot receive it properly, isn&#39;t it ? Ping command can&#39;t work without printf(" t t t ") Delay, neither. Dose any good idea to solve speed/delay problem.