Re: [bgl-discuss] IBM journal issue on BG/L

[Kazutomo Yoshii <kazutomo@xxxxxxxxxxx>]

>www.research.ibm.com/journal/rd49-23.html
>  
>

BG/L related documents are getting more detail.


"Blue Gene/L compute chip: Control, test, and bring-up infrastructure"
mentions debugging method like below

- the service node can access to a 16-KB memory in SRAM(L2) on the
compute node using JTAG commands via ethernet. Thus, the service node
can send boot image to the nodes.

- the service node can read and write the DCRs, even when cpu is hung.
(DCR = Device Control Register)


There was no explanation about software to access the nodes in that
document.


Thanks,
Kaz


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