EP93XX. ARM. ®. 9 Embedded Processor Family. EP93xx. User’s Guide 8×8 Key Mtx. ARMT. Maverick. 18 Bit Raster. LCD I/F. Crunch. Notes on making a proper EABI cross compiler for Maverick Crunch (EP, EP93xx) processors. This is a bit of “higher order hacking” and. It’s already configured to build in /opt/toolchains/ directory. This work is based on patches by Martin Guy and tested both on Cirrus demo board for the EP
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High-Performance, Networked, ARM9, System-on-Chip Processor
The MaverickCrunch is a floating point math coprocessor core intended for digital audio. GCC does not emit conditional Maverick instructions. Maevrick now rare D0 revision has a more extensive range of hardware bugs than the later revisions; from D1-E2 no further modifications were made to the design of the Maverick unit.
The 16 KB instruction cache and 16 KB data cache provide zero-cycle latency to the current program and data, or they can be locked to guarantee no-latency access to critical instructions and data. Solutions Voice Playback Record Control. The Cirrus crunch softfloat library has integer asm code to check maverivk denorm values before these operations e.
MaverickCrunch – Wikipedia
Five versions of the EP93xx silicon were issued: An instruction may be nonexecuted because it is conditional and the condition is false, e. Software and Tools Software and Design Resources available by request. Code to enable forwarding under Linux with Maverick support enabled in the kernel, the effect is limited to the process that does this: The default is signed. It was removed by GCC 4.
The sign is unaffected. This coprocessor greatly accelerates the ARMT’s single- and double-precision integer and floating-point processing capabilities, enabling the EP to perform high-speed mathematical calculations when encoding digital audio and video formats, processing industrial-control algorithms and performing other math-intensive computing and data-processing functions.
[linux-cirrus] I’m pretty close with Maverick Crunch on EP – linux-cirrus – FreeLists
D0, D1, E0, E1 and E2. Views Read Edit View history.
Cirrus Logic’s embedded processor products are complemented by a range of complete operating systems. It disables all bit integer operations which appear to have more unidentified hardware bugs, as mverick by the openssl testsuite. For further information about the Kit and the usage, please contact sales dave.
If there are serialized ones out there, GCC does not emit conditional Maverick instructions, which just leaves the case of a Maverick instruction being in one of the two slots after a branch that is taken, which is covered by -mcirrus-fix-invalid-insns.
Obviously you need to get the unwind specification in the official ARM EABI documents first before implementing it in GCC, and binutils will also need to support generating correct information given. An instruction appears in the coprocessor pipeline, but does not execute for one of the following reasons: Module Height and Width.
Summary of bugs CMP: As you can see in Sec 9. In the sample I have tested a TS it is not operating in serialised mode by these criteria because no exceptions are enabled.
For the latter, Paolo Bonzini [ maverock A test program tickles the bug in both ways on revision E1 silicon. Thus, to use it maverrick, integer and floating point instructions must be interleaved so as to keep both processors busy.
Most crucially, it fails to take proper account of the way that the FPU sets the condition code registers after a comparison, so the code it generates sometimes gets floating point and bit integer comparisons wrong as well as failing to account for several of the hardware bugs. Three developments, described below, will be available with Zefeer CPU boards family: All have a dozen or more hardware bugs which either give imprecise or garbage results or clobber registers or memory when certain sequences of instructions are executed in a certain order.
This thread on binutils mailing list explains why unwind support is needed. The revision of a chip is printed as the 5th and 6th characters of the second line of text on the chip housing. Audio Clock Generation and Jitter Reduction. Please introduce links to this page from related articles ; try the Find link tool for suggestions. Unfortunately these never worked well enough for it to be usable. The EP is a high-performance system-on-chip design that includes a MHz ARM9 processor and is ideal for a range of industrial and consumer electronic applications.
Voice, Record, Control, and Playback. Thermal management guidelines Power consumption benchmarks Power management guidelines. Here are several examples: GCC does not emit conditional Maverick instructions, and the branch case would be covered by mainline’s -mcirrus-fix-invalid-insns flag if that code were not broken: The result underflows directly to zero.
It has a -mfix-cirrus-invalid-insns flag, which is supposed to ensure that the two instructions following a branch are not Cirrus one but fails to do so, and that every cfldrdcfldr64cfstrdcfstr64 is followed by one non-Cirrus instruction, which should fix bugs 1 and 2. Designers of industrial controls, internet radios, digital media servers, audio jukeboxes, thin clients, set-top boxes, point-of-sale terminals, biometric security systems and GPS devices will benefit from the EP’s integrated architecture and advanced features.
In the case of a load, only the lower 32 bits the first word will be loaded into the target register. It also has four bit registers on which can perform a bit multiply-and-accumulate instruction and a status register, as well as conversions between integer and floating point values and instructions to move data between itself and the ARM registers or memory.
The modifications are published as a megabyte tarball from which a single monolithic patch can be derived by diffing it against the mainline source releases.