Re: [U-Boot] Coldfire: bootm: How does bootm pass bootargs to linux?

Richard,

/*

• Linux Kernel Parameters (passing board info data):
• r3: ptr to board info data
• r4: initrd_start or 0 if no initrd
• r5: initrd_end - unused if r4 is 0
• r6: Start of command line string
• r7: End of command line string

*/

Above is the copy and paste from PPC.

My question is, how does bootm passes arguments to the kernel for the

coldfire In ColdFire, the Linux Kernel Parameters is located at u-boot's stack.

(M5271 specifically)? And what is the recommended way to capture and

process the info

in the kernel?

In kernel/head.S, Save the location of u-boot info - cmd line, bd_info, etc movel %a7, uboot_info_stk /* save uboot info to variable */

In kernel/setup.c, unsigned long uboot_info_stk; EXPORT_SYMBOL(uboot_info_stk); static struct uboot_record uboot_info;

int __init uboot_comandline(char *bootargs) { ... uboot_info.bd_info = (*(u32 *)(uboot_info_stk)); uboot_info.initrd_start = (*(u32 *)(uboot_info_stk+4); ... }

Regards, TsiChung