|
From: Joey N. <jo...@jo...> - 2003-04-09 22:32:50
|
Eric, I'm using version 2.0 of mkelfImage. I used syslinux under the standard BIOS to test the kernel. I applied the patch you supplied and it appear the problem is that The kernel command line is not getting set. In the initialize_linux_params function in linux-i386/convert-params, I put debug code to print the command line (info->real_mode->command_line). After it should be initialized, but it appear to be empty. Thanks, Joey Nelson Design Engineer JoeScan www.joescan.com 509-332-3644 -----Original Message----- From: eth...@li... [mailto:eth...@li...] On Behalf Of Eric W. Biederman Sent: Tuesday, April 08, 2003 4:22 PM To: Joey Nelson Cc: 'Etherboot developers list' Subject: Re: [Etherboot-developers] Problem with LinuxBios (latest cvs), Etherboot 5.1.7 - ide_disk, mkelfimg 2.0 "Joey Nelson" <jo...@jo...> writes: > Hello, > > I've very nearly got this all going on my Geode GX1 based system. Interesting you have shortened mkelfImage to mkelfimg. Which version are you running anyway? > It get all the way to loading the linux kernel elf image from a compact > flash and the last thing printed is: > Firmware type: LinuxBIOS The Fimware type: LinuxBIOS is printed by the code prepend to the kernel by mkelfImage. So you image loaded. Which means the image loaded. And I don't expect this disk support LBA48 mode so the recent fix to get that working should not be your issue. > I've tested this same kernel under the syslinux boot loader on the same > system with the same command line and it works fine with a serial > console. syslinux works under LinuxBIOS? Even if you did not test under LinuxBIOS if it works under another BIOS the kernel still should be quite close. > I use the following line to make my kernel.elf image. > mkelfimg --kernel=/usr/src/linux/i386/boot/bzImage \ > --output=kernel.elf \ > --command-line="console=ttyS0,38400n8 root=/dev/hda2" > > Any suggestions on what I should be checking. Last time I saw something like this I traced it down to the kernel dying early in bootup before it could initialize the serial console. Attached is a patch against 2.4.17 but with a little tweaking the code should work on any kernel. It gives very serial console output so you can see what the kernel is actually doing. Eric diff -uNrX linux-exclude-files /mnt/hda1/home/eric/projects/linux/linux-2.4.17/arch/i386/boot/compresse d/misc.c linux-2.4.17.jay/arch/i386/boot/compressed/misc.c --- /mnt/hda1/home/eric/projects/linux/linux-2.4.17/arch/i386/boot/compresse d/misc.c Mon Nov 12 10:59:43 2001 +++ linux-2.4.17.jay/arch/i386/boot/compressed/misc.c Fri Mar 1 13:00:15 2002 @@ -161,6 +161,32 @@ { free_mem_ptr = (long) *ptr; } + +/* Base Address */ +#define TTYS0 0x3f8 +#define TTYS0_LSR (TTYS0+0x05) +#define TTYS0_TBR (TTYS0+0x00) + +static void ttys0_tx_byte(unsigned byte) +{ + /* Wait until I can send a byte */ + while((inb(TTYS0_LSR) & 0x20) == 0) + ; + outb(byte, TTYS0_TBR); + /* Wait until the byte is transmitted */ + while(!(inb(TTYS0_LSR) & 0x40)) + ; +} +static void puts_serial(const char *str) +{ + int c; + while( ( c = *str++ ) != '\0') { + if (c == '\n') { + ttys0_tx_byte('\r'); + } + ttys0_tx_byte(c); + } +} static void scroll(void) { @@ -171,7 +197,7 @@ vidmem[i] = ' '; } -static void puts(const char *s) +static void puts_video(const char *s) { int x,y,pos; char c; @@ -206,6 +232,12 @@ outb_p(0xff & (pos >> 9), vidport+1); outb_p(15, vidport); outb_p(0xff & (pos >> 1), vidport+1); +} + +static void puts(const char *s) +{ + puts_serial(s); + puts_video(s); } static void* memset(void* s, int c, size_t n) diff -uNrX linux-exclude-files /mnt/hda1/home/eric/projects/linux/linux-2.4.17/arch/i386/kernel/setup.c linux-2.4.17.jay/arch/i386/kernel/setup.c --- /mnt/hda1/home/eric/projects/linux/linux-2.4.17/arch/i386/kernel/setup.c Fri Dec 21 10:41:53 2001 +++ linux-2.4.17.jay/arch/i386/kernel/setup.c Mon Feb 25 17:15:39 2002 @@ -779,12 +779,89 @@ } } +#if 1 +#include <linux/console.h> +#include <asm/io.h> + +static void ttys0_write(struct console *console, const char *str, unsigned len); + +static struct console minimal_serial_console = { + write: ttys0_write, + flags: CON_ENABLED, + next: NULL, +}; + +/* Base Address */ +#define TTYS0 0x3f8 +/* Data */ +#define TTYS0_RBR (TTYS0+0x00) +#define TTYS0_TBR (TTYS0+0x00) +/* Control */ +#define TTYS0_IER (TTYS0+0x01) +#define TTYS0_IIR (TTYS0+0x02) +#define TTYS0_FCR (TTYS0+0x02) +#define TTYS0_LCR (TTYS0+0x03) +#define TTYS0_MCR (TTYS0+0x04) + +#define TTYS0_DLL (TTYS0+0x00) +#define TTYS0_DLM (TTYS0+0x01) +/* Status */ +#define TTYS0_LSR (TTYS0+0x05) +#define TTYS0_MSR (TTYS0+0x06) +#define TTYS0_SCR (TTYS0+0x07) + +#define TTYS0_BAUD 9600 +#define TTYS0_DIV (115200/TTYS0_BAUD) + +static void ttys0_init(void) +{ + /* disable interrupts */ + outb(0x0, TTYS0_IER); + /* enable fifo's */ + outb(0x01, TTYS0_FCR); + /* Set Baud Rate Divisor to TTYS0_BAUD */ + outb(0x83, TTYS0_LCR); + outb(TTYS0_DIV & 0xFF, TTYS0_DLL); + outb((TTYS0_DIV >> 8) & 0xFF, TTYS0_DLM); + outb(0x03, TTYS0_LCR); + +} +static void ttys0_tx_byte(unsigned byte) +{ + while((inb(TTYS0_LSR) & 0x20) == 0) + ; + outb(byte, TTYS0_TBR); +} +static void ttys0_write(struct console *console, const char *str, unsigned len) +{ + static int firsttime = 1; + int c; + if ((console->next) || (console_drivers != &minimal_serial_console)) + return; + if (firsttime) { + firsttime = 0; + ttys0_init(); + } + while(len--) { + c = *str++; + if (c == '\n') { + ttys0_tx_byte('\r'); + } + ttys0_tx_byte(c); + } +} + +#endif + void __init setup_arch(char **cmdline_p) { unsigned long bootmap_size, low_mem_size; unsigned long start_pfn, max_pfn, max_low_pfn; int i; +#if 1 + console_drivers = &minimal_serial_console; +#endif #ifdef CONFIG_VISWS visws_get_board_type_and_rev(); #endif ------------------------------------------------------- This SF.net email is sponsored by: ValueWeb: Dedicated Hosting for just $79/mo with 500 GB of bandwidth! No other company gives more support or power for your dedicated server http://click.atdmt.com/AFF/go/sdnxxaff00300020aff/direct/01/ _______________________________________________ Etherboot-developers mailing list Eth...@li... https://lists.sourceforge.net/lists/listinfo/etherboot-developers |
