Linux Image

Linux Image

[Aman]

Hi All

I have an rom monitor code without ethernet support running on PPC440GP. Is
it possible to download a linux image to the board using the Kermit
protocol. If so what type of linux image has to build for that.

Thanking you in advance
Regards
Aman


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Re: Linux Image

[Wolfgang Denk]

In message <001701c247e1$af6bb380$370da8c0@aman> you wrote:
>
> I have an rom monitor code without ethernet support running on PPC440GP. Is

Install PPCBoot.

> it possible to download a linux image to the board using the Kermit
> protocol. If so what type of linux image has to build for that.

Yes, this is possible. PPCBoot supports kermit binary  protocol  (use
the  "loadb" command). Umm... but PPCBoot also supports download over
ethernet, so you probably will not use "loadb".

Best regards,

Wolfgang Denk

--
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd@denx.de
Testing can show the presense of bugs, but not their absence.
                                                   -- Edsger Dijkstra

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Base Baud Calculation

[Aman]

Hi

How is the base_baud in linux calculated?.

Thanking you in advance

Regards
Aman


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Re: Base Baud Calculation

[Eugene Surovegin]

Aman,

At 03:57 AM 11/3/2002, you wrote:
>  How is the base_baud in linux for PPC 440GP calculated?.

Here is the piece of code I use on our custom 440GP board (works also on
Ebony):

static void __init XXXXXXX_serial_init(void){

     struct serial_struct serial_req;
     int baud_base;

     /* Determine baud base */
     unsigned long cpc0_cr0 = mfdcr(DCRN_CPC0_CR0);

     if (cpc0_cr0 & 0x00400000){
         /* External UART0 clock (eval board uses 6*1.8432 MHz clock) */
         baud_base = (6 * 1843200) / 16;
     }
     else {
         /* Internal UART0 clock */
        int uart_div = ((cpc0_cr0 & 0x001f0000) >> 16) + 1;
         baud_base = (XXXXXX_clocks.plb * 1000000) / uart_div / 16;
     }

     /* Setup ioremapped serial port access */
     memset(&serial_req, 0, sizeof(serial_req));
     serial_req.line = 0;
     serial_req.baud_base = baud_base;
     serial_req.port = 0;
     serial_req.irq = UART0_INT;
     serial_req.flags = ASYNC_BOOT_AUTOCONF | ASYNC_SKIP_TEST;
     serial_req.io_type = SERIAL_IO_MEM;
     serial_req.iomem_base = ioremap64(PPC440GP_UART0_ADDR, 8);
     serial_req.iomem_reg_shift = 0;

     if (early_serial_setup(&serial_req) != 0) {
         printk(KERN_ALERT"Early serial init of port 0 failed\n");
     }
}

One comment, XXXXXX_clocks - structure that holds different clocks in MHz.
For example, XXXXXX_clocks.plb is equal to 133.

Usually, this value can be hardcoded, but I find this way more convenient,
especially when running the same image on different boards with different
clock setup.

Regards,

  Eugene Surovegin <mailto:ebs@innocent.com>


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