From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Alex Lennon" To: Subject: [ECOS] Re: Romboot in i386 (continued) - comms. problems Date: Mon, 13 Aug 2001 03:21:00 -0000 Message-id: X-SW-Source: 2001-08/msg00376.html >> >It's the first stage in providing some way for a PC to directly boot from >> >ROM/Flash. It's not been made to work on any particular platform yet >> >> Is the thrust of this code attempting to boot the PC off an add-in BIOS >> (e.g. at C800:0) or as a complete mainboard BIOS replacement to take over >> at power-on? >The latter. See romboot.S. But it's not been tested with a live platform so >take it with a pinch of salt for now. Hi - I've been taking a look at porting Redboot to at Arcom Merlin board (25Mhz 386ex, 1Mb flash, 2Mb DRAM). I'm happy enough with a modified romboot.S entering PM and jumping to the Redboot code. I get the signons and can enter commands etc. etc. However I'm getting a lot of funnies downloading images over a serial link (they are the correct .srec format now, I think) and connecting with GDB. At the 38K4 baud default I seem to be dropping lots of chars. When I go right down to 1200 I can do an Xmodem image download OK. The i386 port seems to be using serial drivers in ~/ecos/packages/hal/i386/pcmb/current/src/pcmb_serial.c Looking at these serial drivers it seems to me that somebody has implemented a polled mode schema on both Rx and Tx. Could somebody tell me if this is correct ? If so, then before I dive straight in and rewrite the code, is there any reason I shouldn't just use the 16x5x drivers already in eCos ? TIA, Alex Lennon _____________________________________________________________________ This message has been checked for all known viruses by UUNET delivered through the MessageLabs Virus Control Centre. For further information visit http://www.uk.uu.net/products/security/virus/