[nuttx] data abort issues(maybe linker script issues)

Hi, Since there is only 256k of internal memory(starting from 0x00800000 and finishing at 0x00840000 ) on the compal_e99, And that in nuttx we went over 0x00840000(which is bad and may be cause a similar data abort than the follownig one), I wonder if we could use the external RAM like in the attached patch(we're a bit short on memory). However the patch may still be wrong because it still produces a data abort: nsh> nxtext nxtext [2:100] nsh> nxtext_initialize: Initializing external graphics device nxtext_initialize: Open NX [...] nxtext_main: NX handle=1006ea0 nxtext_main: Set background color=32 [...] row: 60 col: 0 npixels: 98 row: 61 col: 0 npixels: 98 row: 62 col: 0 npixels: 98 row: 63 col: 0 npixels: 98 row: 64 col: 0 npixels: 98 row: 65 col: 0 npixels: 98 row: 66 col: 0 npixels: 98 [...] row: 50 col: 0 npixels: 98 rowData abort. PC: 00826090 Assertion failed at file:arm/up_dataabort.c line: 198 error code: 32773 sp: 01006d78 IRQ stack: base: 010003fc size: 000003fc User stack: base: 01006e88 size: 000007fc 01006d60: 00008005 000000b0 008212d4 008318f0 01006d80 000000c6 00008005 000000b0 01006d80: 00000055 0100104c 008210ec a0000053 00821128 00826090 0082012c 01001444 01006da0: 00000000 e1d2c0b0 e20c10ff 00000020 000000b0 00000055 0100104c 00832df8 01006dc0: 01006ea4 00000000 00000000 0100104c 01006de0 00826014 00826090 a0000053 01006de0: 00000011 01001058 01000d24 0082ac98 00832c48 01000d24 01000d24 00832c48 01006e00: 01006ea4 01000d52 01006ea4 0082aef0 01006ea4 01000d24 00832c48 00000018 01006e20: 008327d0 00000006 008327cd 0082a744 01006ea4 008327cd 00000008 008327d6 01006e40: 00000001 00000001 00000000 008327cd 01006ea4 00000000 00000000 0082a3c4 01006e60: 00000001 00000020 00000000 00000000 00000000 00000000 00000000 00823c54 01006e80: 00000000 00000000 00000000 00000000 00000000 00000000 00000060 80000810 R0: 01001444 00000000 e1d2c0b0 e20c10ff 00000020 000000b0 00000055 0100104c R8: 00832df8 01006ea4 00000000 00000000 0100104c 01006de0 00826014 00826090 CPSR: a0000053 The PC is in the following malloc, but sometimes it was previously in semaphores... 00825fec <malloc>: 825fec: e92d4038 push {r3, r4, r5, lr} 825ff0: e2504000 subs r4, r0, #0 825ff4: 0a000020 beq 82607c <malloc+0x90> 825ff8: e2844017 add r4, r4, #23 825ffc: e3c4500f bic r5, r4, #15 826000: ebffffa2 bl 825e90 <mm_takesemaphore> 826004: e3550501 cmp r5, #4194304 ; 0x400000 826008: 23a00012 movcs r0, #18 82600c: 31a00005 movcc r0, r5 826010: 3bffffe9 blcc 825fbc <mm_size2ndx> 826014: e59f309c ldr r3, [pc, #156] ; 8260b8 <malloc+0xcc> 826018: e0830200 add r0, r3, r0, lsl #4 82601c: e5904008 ldr r4, [r0, #8] 826020: ea000000 b 826028 <malloc+0x3c> 826024: e5944008 ldr r4, [r4, #8] 826028: e3540000 cmp r4, #0 82602c: 0a000011 beq 826078 <malloc+0x8c> 826030: e5943000 ldr r3, [r4] 826034: e1530005 cmp r3, r5 826038: 3afffff9 bcc 826024 <malloc+0x38> 82603c: ea000011 b 826088 <malloc+0x9c> 826040: e0840005 add r0, r4, r5 826044: e7843005 str r3, [r4, r5] 826048: e5805004 str r5, [r0, #4] 82604c: e5845000 str r5, [r4] 826050: e0842002 add r2, r4, r2 826054: e5921004 ldr r1, [r2, #4] 826058: e2011102 and r1, r1, #-2147483648 ; 0x80000000 82605c: e1833001 orr r3, r3, r1 826060: e5823004 str r3, [r2, #4] 826064: ebffffba bl 825f54 <mm_addfreechunk> 826068: e5943004 ldr r3, [r4, #4] 82606c: e3833102 orr r3, r3, #-2147483648 ; 0x80000000 826070: e5843004 str r3, [r4, #4] 826074: e2844008 add r4, r4, #8 826078: ebffffa1 bl 825f04 <mm_givesemaphore> 82607c: e1a00004 mov r0, r4 826080: e8bd4038 pop {r3, r4, r5, lr} 826084: e12fff1e bx lr 826088: e2842008 add r2, r4, #8 82608c: e892000c ldm r2, {r2, r3} 826090: e5832008 str r2, [r3, #8] 826094: e5943008 ldr r3, [r4, #8] 826098: e3530000 cmp r3, #0 82609c: 1594200c ldrne r2, [r4, #12] 8260a0: 1583200c strne r2, [r3, #12] 8260a4: e5942000 ldr r2, [r4] 8260a8: e0653002 rsb r3, r5, r2 8260ac: e353000f cmp r3, #15 8260b0: 9affffec bls 826068 <malloc+0x7c> 8260b4: eaffffe1 b 826040 <malloc+0x54> 8260b8: 01001414 tsteq r0, r4, lsl r4 The data abort prevents us from testing the lcd with the nuttx examples applications that makes use of the LCD.... (for now it only draws a background and then crash like mentioned above). I've also attached the appconfig and the defconfig. What other informations should I give? The branch I'm using is here: https://gitorious.org/gnutoo-s-for-upstream-osmocom-bb-and-nuttx-bb/nuttx-b… gta02/commits/lcd-cleanup (which will be rebased for cleanup purposes). Denis.