Re: [Xen-devel] [PATCH V8 RESEND] ns16550: Add support for UART present in Broadcom TruManage capable NetXtreme chips

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Tue, 2014-02-25 at 15:11 -0600, Aravind Gopalakrishnan wrote:
> Since it is an MMIO device, the code has been modified to accept MMIO based
> devices as well. MMIO device settings are populated in the 'uart_config' 
> table.
> It also advertises 64 bit BAR. Therefore, code is reworked to account for 64
> bit BAR and 64 bit MMIO lengths.
> 
> Some more quirks are - the need to shift the register offset by a specific
> value and we also need to verify (UART_LSR_THRE && UART_LSR_TEMT) bits before
> transmitting data.
> 
> While testing, include com1=115200,8n1,pci,0 on the xen cmdline to observe
> output on console using SoL.
> 
> Changes from V7:
>   - per Jan's comments:
>     - Moving pci_ro_device to ns16550_init_postirq() so that either
>       one of pci_hide_device or pci_ro_device is done at one place
>     - remove leading '0' from printk as absent segment identifier
>       implies zero anyway.
>   - per Ian's comments:
>     - fixed issues that casued his build to fail.
>     - cross-compiled for arm32 and arm64 after applying patch and
>       build was successful on local machine.

Unfortunately this patch breaks the console on the arm64 x-gene
platform, it drops a fairly large subset of the characters.

I'm not sure why yet.

Ian.


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