| 00:12.03 | adeeln | is buildroot safe to use with gcc 4+ as the compiler in the toolchain? |
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| 15:39.54 | surfbuddy | whats a CP15 ? |
| 15:48.26 | surfbuddy | i thnk this channel must quit .. there is hardly any activity here.. or how can i get someone respond ???????? |
| 15:49.05 | jbevren | try asking when there's no major vacation going (like, new year's) |
| 15:49.09 | jbevren | maybe next week? |
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| 15:50.25 | surfbuddy | so...how is it like..ppl log in and remain logged in forever.. never switch their comps off ? |
| 15:51.23 | jbevren | <- guilty |
| 15:51.29 | jbevren | where'd you hear of this cp15? |
| 15:51.31 | jbevren | who makes it? |
| 15:51.44 | surfbuddy | its an ARM register |
| 15:51.49 | jbevren | ah |
| 15:52.21 | surfbuddy | do u hve any idea how to access this register ? |
| 15:52.32 | jbevren | I dont, I was just googling here :) |
| 15:52.44 | jbevren | looks like it's a TLB base register? |
| 15:52.49 | surfbuddy | i hve some probs with DataAborts. |
| 15:53.00 | jbevren | alignment issues? |
| 15:53.25 | surfbuddy | i dont knw.. i just wanna see if the MMU is enabled or dis |
| 15:53.48 | jbevren | ah, look for a cpu control register. ;) |
| 15:54.17 | jbevren | I imagine you could load the TLB (cp15) and not have the MMU enabled |
| 15:54.28 | jbevren | so checking that woudltn accurately determine its status |
| 15:54.58 | surfbuddy | whats a TLB ? |
| 15:55.21 | jbevren | translation lookaside buffer. It's what the MMU uses to translate virtual addresses into physical ones |
| 15:55.34 | surfbuddy | ah ! i know now..was just missing the abb |
| 15:55.42 | jbevren | http://www.simplemachines.it/doc/ARMv6_Architecture.pdf page 6 |
| 15:55.46 | jbevren | pink part is TLB |
| 15:56.09 | surfbuddy | do u know anything abt Data aborts ? |
| 15:56.12 | jbevren | judging by the diagram (fig.2) cp15 might be what to check |
| 15:56.27 | jbevren | I dont. I just know that arm sometimes quietly fails to read properly on misaligned reads |
| 15:58.19 | surfbuddy | jbevren, in page 12 .. theres some info |
| 15:58.55 | surfbuddy | when the A bit in CP15 register is set.. |
| 15:59.28 | surfbuddy | how do i access this register and disable the A bit. for eg |
| 15:59.35 | jbevren | no idea :P |
| 15:59.48 | surfbuddy | alrite |
| 16:00.12 | jbevren | Ive never done ARM assembly, and even what Ive studied is just user-levle programming |
| 16:19.47 | T0mW | surfbuddy: you have to access the coprocessor (MMU) via assembly instructions, sush as: |
| 16:19.50 | T0mW | <PROTECTED> |
| 16:19.50 | T0mW | <PROTECTED> |
| 16:19.50 | T0mW | <PROTECTED> |
| 16:20.26 | T0mW | mrc == "move to register from coprocessor" |
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| 16:22.47 | T0mW | surfbuddy: "ARM System Developers Guide", from Amazon.com, ISBN #1-55860-874-5, it has a really good section on programming the MMU |
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| 18:18.07 | surfbuddy | T0mW, are u still there... ? |
| 18:18.15 | T0mW | yeah |
| 18:18.43 | surfbuddy | T0mW, my MIRC client does not give info when a message is written to me.. |
| 18:18.49 | surfbuddy | T0mW, does it for you ? |
| 18:21.04 | surfbuddy | T0mW, but can i not see the MMU status by peeping in one of the registers ? |
| 18:22.01 | surfbuddy | T0mW, anyways see u in a while.. |
| 18:22.35 | T0mW | surfbuddy: AFAIK, you cannot use a JTAG to "see" the coprocessor (MMU) registers.. Having said that, you may find some documentation at arm.com about the MMU which may suggest otherwise. |
| 18:24.01 | T0mW | surfbuddy: I use xchat here for IRC, I see every message. |
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| 19:49.02 | surfbuddy | T0mW, how significant is the CP15 register ? |
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| 22:41.23 | Crofton | ok |
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