Update of /cvsroot/linuxdc/linux
In directory usw-pr-cvs1:/tmp/cvs-serv19846
Modified Files:
TODO.dc ChangeLog.dc
Log Message:
Minor cosmetic changes to PCI and BBA
Index: TODO.dc
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RCS file: /cvsroot/linuxdc/linux/TODO.dc,v
retrieving revision 1.1
retrieving revision 1.2
diff -C2 -r1.1 -r1.2
*** TODO.dc 2001/03/13 10:28:47 1.1
--- TODO.dc 2001/03/15 05:42:55 1.2
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*** 1,4 ****
--- 1,20 ----
LinuxDC list of things TODO
+ 2001-03-14:
+
+ - New problem with PCI: Ethernet program loaders such as dcload-ip initalize
+ the GAPS subsystem to a known state, therefore when the kernel is uploaded
+ via the BBA it "technically" needs no further GAPS initialization for
+ the 8139C driver to load sucessfully. However, the latest snapshot of
+ pci_gaps.c didn't do any init of the PCI bus whatsoever, and attempts
+ to load the kernel via serial cable or a boot CD (where GAPS hasn't been
+ initialized yet) will not load the BBA properly. The problem is that
+ interrupts aren't being sent from GAPS to the SH4's IRQ 11, so the BBA is
+ able to transmit, but unable to receive. I've have since added Dan Potter's
+ BBA initialization routine to pci_gaps, thinking that I missed an step
+ somewhere, but interrupts still aren't being detected by the system.
+
+ 2001-03-13:
+
- Talk to NIIBE Yutaka <gn...@m1...> about merging our changes into
the LinuxSH kernel. This would have the cool side effect of our code going
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*** 15,18 ****
--- 31,42 ----
tested. But overall, the cause of the screwed-up frames needs to be found
and fixed.
+
+ [FIXED] The RxConfig Ring Buffer size was statically defined to 32K, even
+ though I had added a conditional to make it 16K for the DC (the GAPS PCI
+ interface only has 32K _total_ PCI DMA). Because the 8139C thought this
+ buffer was 32K it was causing buffer overruns (resulting in broken,
+ mishapen RX frames everywhere) and networking performance was abysmal.
+ After adding the correct value to the rtl8139_rx_config constant, there are
+ no further problems with network performance.
- Hmm, the FB driver is SLOW!! I should've known, given all the warnings on
Index: ChangeLog.dc
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RCS file: /cvsroot/linuxdc/linux/ChangeLog.dc,v
retrieving revision 1.8
retrieving revision 1.9
diff -C2 -r1.8 -r1.9
*** ChangeLog.dc 2001/03/14 21:37:19 1.8
--- ChangeLog.dc 2001/03/15 05:42:55 1.9
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*** 1,4 ****
--- 1,14 ----
2001-03-14 M. R. Brown <mr...@li...>
+ * drivers/pci/pci.ids: Added the device id for the Dreamcast
+ Broadband Adapter.
+ * include/linux/pci_ids.h: Added definitions for Sega's vendor id and
+ the BBA's device id.
+ * drivers/net/8139too.c: Change the name of the BBA to Dreamcast...
+ rather than Sega.
+
+ * TODO.dc: Mention the current PCI bug, and the fix for the 8139C Rx
+ ring buffer size bug.
+
* drivers/net/8139too.c [rtl8139_rx_config]: Added a shift for
RX_BUF_LEN_IDX to make sure the 16k buffer was being selected (this
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