From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <3727E20F.BC03ADD2@bwhitehead.com> Date: Wed, 28 Apr 1999 23:37:35 -0500 From: Bill Whitehead Reply-To: parman@bwhitehead.com MIME-Version: 1.0 To: linuxppc-dev@lists.linuxppc.org CC: parman@bwhitehead.com Subject: help with bootup code Content-Type: text/plain; charset=us-ascii Sender: owner-linuxppc-dev@lists.linuxppc.org List-Id: I am just learning Linux and hope to port it to a custom platform using older I/O chipsets(W83c553 and 87307). Basically the system consists of a 603/MPC106 with 64M sdram, PCI to ISA and IDE interface(W83c553), and I/O controller(87307). I believe the basic system is already supportted by Linux but support for I/O chipsets must be added. I am using LinuxPPC 4.1 while waiting for release 5. I can load the compiled kernel into high memory and jump to head.S. I have traced the boot code(arch/ppc/boot) and think I understand the relocate, vga_init, and decompress code but am unable to determine where the input is coming from when fill_inbuf() is called. It gets input from an array(input_data[]?) but I can't find where the data is assigned to that array. I don't see an open call, a pointer assignment, or a memcpy to draw data from. The kernel isn't running yet so Linux device drivers aren't supplying the data. The code is something like "if ( data_ptr < buffer_size) { data_inbuf[data_ptr] = input_data[offset]; data_ptr++;}". I am sorry but I don't have the code accessible at the moment. If this is too confusing to answer, I will re-submit it tomorrow evening when the source code listings will be available. I check the list in the evening and am trying to get feedback as soon as possible. I have been monitoring this list for a few weeks and have not seen these chips mentioned except once when someone, from Korea(?), indicated they were interested in porting Linux to a Motorola YellowKnife system which uses them. (if your that person let me know how its going!) Thanks in advance for you help, Bill Whitehead parman@bwhitehead.com [[ This message was sent via the linuxppc-dev mailing list. Replies are ]] [[ not forced back to the list, so be sure to Cc linuxppc-dev if your ]] [[ reply is of general interest. Please check http://lists.linuxppc.org/ ]] [[ and http://www.linuxppc.org/ for useful information before posting. ]]